Earn your degree and find the_financial_aid you needEarn your degree and find the_financial_aid you need anvil_rate_time_unit (default: 60s) The time unit over which client connection rates and other rates are calculated. This feature is implemented by the anvil(8) service which is available in Postfix version 2.2 and later. The default interval is relatively short. Because of the high frequency of updates, the anvil(8) server uses volatile memory only. Thus, information is lost whenever the process terminates. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds). anvil_status_update_time (default: 600s) How frequently the anvil(8) connection and rate limiting server logs peak usage information. This feature is available in Postfix 2.2 and later. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds). append_at_myorigin (default: yes) With locally submitted mail, append the string "@$myorigin" to mail addresses without domain information. With remotely submitted mail, append the string "@$remote_header_rewrite_domain" instead. Note 1: this feature is enabled by default and must not be turned off. Postfix does not support domain-less addresses. Note 2: with Postfix version 2.2, message header address rewriting happens only when one of the following conditions is true: · The message is received with the Postfix sendmail(1) command, · The message is received from a network client that matches $local_header_rewrite_clients, · The message is received from the network, and the remote_header_rewrite_domain parameter specifies a non-empty value. To get the behavior before Postfix version 2.2, specify "local_header_rewrite_clients = static:all". append_dot_mydomain (default: yes) With locally submitted mail, append the string ".$mydomain" to addresses that have no ".domain" information. With remotely submitted mail, append the string ".$remote_header_rewrite_domain" instead. Note 1: this feature is enabled by default. If disabled, users will not be able to send mail to "user@partialdomainname" but will have to specify full domain names instead. Note 2: with Postfix version 2.2, message header address rewriting happens only when one of the following conditions is true: · The message is received with the Postfix sendmail(1) command, · The message is received from a network client that matches $local_header_rewrite_clients, · The message is received from the network, and the remote_header_rewrite_domain parameter specifies a non-empty value. To get the behavior before Postfix version 2.2, specify "local_header_rewrite_clients = static:all". application_event_drain_time (default: 100s) How long the postkick(1) command waits for a request to enter the server’s input buffer before giving up. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds). This feature is available in Postfix 2.1 and later. authorized_flush_users (default: static:anyone) List of users who are authorized to flush the queue. By default, all users are allowed to flush the queue. Access is always granted if the invoking user is the super-user or the $mail_owner user. Otherwise, the real UID of the process is looked up in the system password file, and access is granted only if the corresponding login name is on the access list. The username "unknown" is used for processes whose real UID is not found in the password file. Specify a list of user names, "/file/name" or "type:table" patterns, separated by commas and/or whitespace. The list is matched left to right, and the search stops on the first match. A "/file/name" pattern is replaced by its contents; a "type:table" lookup table is matched when a name matches a lookup key (the lookup result is ignored). Continue long lines by starting the next line with whitespace. Specify "!pattern" to exclude a name from the list. The form "!/file/name" is supported only in Postfix version 2.4 and later. This feature is available in Postfix 2.2 and later. authorized_mailq_users (default: static:anyone) List of users who are authorized to view the queue. By default, all users are allowed to view the queue. Access is always granted if the invoking user is the super-user or the $mail_owner user. Otherwise, the real UID of the process is looked up in the system password file, and access is granted only if the corresponding login name is on the access list. The username "unknown" is used for processes whose real UID is not found in the password file. Specify a list of user names, "/file/name" or "type:table" patterns, separated by commas and/or whitespace. The list is matched left to right, and the search stops on the first match. A "/file/name" pattern is replaced by its contents; a "type:table" lookup table is matched when a name matches a lookup key (the lookup result is ignored). Continue long lines by starting the next line with whitespace. Specify "!pattern" to exclude a user name from the list. The form "!/file/name" is supported only in Postfix version 2.4 and later. This feature is available in Postfix 2.2 and later. authorized_submit_users (default: static:anyone) List of users who are authorized to submit mail with the sendmail(1) command (and with the privileged postdrop(1) helper command). By default, all users are allowed to submit mail. Otherwise, the real UID of the process is looked up in the system password file, and access is granted only if the corresponding login name is on the access list. The username "unknown" is used for processes whose real UID is not found in the password file. To deny mail submission access to all users specify an empty list. Specify a list of user names, "/file/name" or "type:table" patterns, separated by commas and/or whitespace. The list is matched left to right, and the search stops on the first match. A "/file/name" pattern is replaced by its contents; a "type:table" lookup table is matched when a name matches a lookup key (the lookup result is ignored). Continue long lines by starting the next line with whitespace. Specify "!pattern" to exclude a user name from the list. The form "!/file/name" is supported only in Postfix version 2.4 and later. Example: authorized_submit_users = !www, static:all This feature is available in Postfix 2.2 and later. authorized_verp_clients (default: $mynetworks) What SMTP clients are allowed to specify the XVERP command. This command requests that mail be delivered one recipient at a time with a per recipient return address. By default, only trusted clients are allowed to specify XVERP. This parameter was introduced with Postfix version 1.1. Postfix version 2.1 renamed this parameter to smtpd_authorized_verp_clients and changed the default to none. Specify a list of network/netmask patterns, separated by commas and/or whitespace. The mask specifies the number of bits in the network part of a host address. You can also specify hostnames or .domain names (the initial dot causes the domain to match any name below it), "/file/name" or "type:table" patterns. A "/file/name" pattern is replaced by its contents; a "type:table" lookup table is matched when a table entry matches a lookup string (the lookup result is ignored). Continue long lines by starting the next line with whitespace. Specify "!pattern" to exclude an address or network block from the list. The form "!/file/name" is supported only in Postfix version 2.4 and later. Note: IP version 6 address information must be specified inside [] in the authorized_verp_clients value, and in files specified with "/file/name". IP version 6 addresses contain the ":" character, and would otherwise be confused with a "type:table" pattern. backwards_bounce_logfile_compatibility (default: yes) Produce additional bounce(8) logfile records that can be read by Postfix versions before 2.0. The current and more extensible "name = value" format is needed in order to implement more sophisticated functionality. This feature is available in Postfix 2.1 and later. berkeley_db_create_buffer_size (default: 16777216) The per-table I/O buffer size for programs that create Berkeley DB hash or btree tables. Specify a byte count. This feature is available in Postfix 2.0 and later. berkeley_db_read_buffer_size (default: 131072) The per-table I/O buffer size for programs that read Berkeley DB hash or btree tables. Specify a byte count. This feature is available in Postfix 2.0 and later. best_mx_transport (default: empty) Where the Postfix SMTP client should deliver mail when it detects a "mail loops back to myself" error condition. This happens when the local MTA is the best SMTP mail exchanger for a destination not listed in $mydestination, $inet_interfaces, $proxy_interfaces, $virtual_alias_domains, or $virtual_mailbox_domains. By default, the Postfix SMTP client returns such mail as undeliverable. Specify, for example, "best_mx_transport = local" to pass the mail from the Postfix SMTP client to the local(8) delivery agent. You can specify any message delivery "transport" or "transport:nexthop" that is defined in the master.cf file. See the transport(5) manual page for the syntax and meaning of "transport" or "transport:nexthop". However, this feature is expensive because it ties up a Postfix SMTP client process while the local(8) delivery agent is doing its work. It is more efficient (for Postfix) to list all hosted domains in a table or database. biff (default: yes) Whether or not to use the local biff service. This service sends "new mail" notifications to users who have requested new mail notification with the UNIX command "biff y". For compatibility reasons this feature is on by default. On systems with lots of interactive users, the biff service can be a performance drain. Specify "biff = no" in main.cf to disable. body_checks (default: empty) Optional lookup tables for content inspection as specified in the body_checks(5) manual page. Note: with Postfix versions before 2.0, these rules inspect all content after the primary message headers. body_checks_size_limit (default: 51200) How much text in a message body segment (or attachment, if you prefer to use that term) is subjected to body_checks inspection. The amount of text is limited to avoid scanning huge attachments. This feature is available in Postfix 2.0 and later. bounce_notice_recipient (default: postmaster) The recipient of postmaster notifications with the message headers of mail that Postfix did not deliver and of SMTP conversation transcripts of mail that Postfix did not receive. This feature is enabled with the notify_classes parameter. bounce_queue_lifetime (default: 5d) The maximal time a bounce message is queued before it is considered undeliverable. By default, this is the same as the queue life time for regular mail. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is d (days). Specify 0 when mail delivery should be tried only once. This feature is available in Postfix 2.1 and later. bounce_service_name (default: bounce) The name of the bounce(8) service. This service maintains a record of failed delivery attempts and generates non-delivery notifications. This feature is available in Postfix 2.0 and later. bounce_size_limit (default: 50000) The maximal amount of original message text that is sent in a non- delivery notification. Specify a byte count. If you increase this limit, then you should increase the mime_nesting_limit value proportionally. bounce_template_file (default: empty) Pathname of a configuration file with bounce message templates. These override the built-in templates of delivery status notification (DSN) messages for undeliverable mail, for delayed mail, successful delivery, or delivery verification. The bounce(5) manual page describes how to edit and test template files. Template message body text may contain $name references to Postfix configuration parameters. The result of $name expansion can be previewed with "postconf -b file_name" before the file is placed into the Postfix configuration directory. This feature is available in Postfix 2.3 and later. broken_sasl_auth_clients (default: no) Enable inter-operability with SMTP clients that implement an obsolete version of the AUTH command (RFC 4954). Examples of such clients are MicroSoft Outlook Express version 4 and MicroSoft Exchange version 5.0. Specify "broken_sasl_auth_clients = yes" to have Postfix advertise AUTH support in a non-standard way. canonical_classes (default: envelope_sender, envelope_recipient, header_sender, header_recipient) What addresses are subject to canonical_maps address mapping. By default, canonical_maps address mapping is applied to envelope sender and recipient addresses, and to header sender and header recipient addresses. Specify one or more of: envelope_sender, envelope_recipient, header_sender, header_recipient This feature is available in Postfix 2.2 and later. canonical_maps (default: empty) Optional address mapping lookup tables for message headers and envelopes. The mapping is applied to both sender and recipient addresses, in both envelopes and in headers, as controlled with the canonical_classes parameter. This is typically used to clean up dirty addresses from legacy mail systems, or to replace login names by Firstname.Lastname. The table format and lookups are documented in canonical(5). For an overview of Postfix address manipulations see the ADDRESS_REWRITING_README document. If you use this feature, run "postmap /etc/postfix/canonical" to build the necessary DBM or DB file after every change. The changes will become visible after a minute or so. Use "postfix reload" to eliminate the delay. Note: with Postfix version 2.2, message header address mapping happens only when message header address rewriting is enabled: · The message is received with the Postfix sendmail(1) command, · The message is received from a network client that matches $local_header_rewrite_clients, · The message is received from the network, and the remote_header_rewrite_domain parameter specifies a non-empty value. To get the behavior before Postfix version 2.2, specify "local_header_rewrite_clients = static:all". Examples: canonical_maps = dbm:/etc/postfix/canonical canonical_maps = hash:/etc/postfix/canonical cleanup_service_name (default: cleanup) The name of the cleanup(8) service. This service rewrites addresses into the standard form, and performs canonical(5) address mapping and virtual(5) aliasing. This feature is available in Postfix 2.0 and later. command_directory (default: see postconf -d output) The location of all postfix administrative commands. command_execution_directory (default: empty) The local(8) delivery agent working directory for delivery to external command. Failure to change directory causes the delivery to be deferred. The following $name expansions are done on command_execution_directory before the directory is changed. Expansion happens in the context of the delivery request. The result of $name expansion is filtered with the character set that is specified with the execution_directory_expansion_filter parameter. $user The recipient’s username. $shell The recipient’s login shell pathname. $home The recipient’s home directory. $recipient The full recipient address. $extension The optional recipient address extension. $domain The recipient domain. $local The entire recipient localpart. $recipient_delimiter The system-wide recipient address extension delimiter. ${name?value} Expands to value when $name is non-empty. ${name:value} Expands to value when $name is empty. Instead of $name you can also specify ${name} or $(name). This feature is available in Postfix 2.2 and later. command_expansion_filter (default: see postconf -d output) Restrict the characters that the local(8) delivery agent allows in $name expansions of $mailbox_command and $command_execution_directory. Characters outside the allowed set are replaced by underscores. command_time_limit (default: 1000s) Time limit for delivery to external commands. This limit is used by the local(8) delivery agent, and is the default time limit for delivery by the pipe(8) delivery agent. Note: if you set this time limit to a large value you must update the global ipc_timeout parameter as well. config_directory (default: see postconf -d output) The default location of the Postfix main.cf and master.cf configuration files. This can be overruled via the following mechanisms: · The MAIL_CONFIG environment variable (daemon processes and commands). · The "-c" command-line option (commands only). With Postfix command that run with set-gid privileges, a config_directory override requires either root privileges, or it requires that the directory is listed with the alternate_config_directories parameter in the default main.cf file. connection_cache_protocol_timeout (default: 5s) Time limit for connection cache connect, send or receive operations. The time limit is enforced in the client. This feature is available in Postfix 2.3 and later. connection_cache_service_name (default: scache) The name of the scache(8) connection cache service. This service maintains a limited pool of cached sessions. connection_cache_status_update_time (default: 600s) How frequently the scache(8) server logs usage statistics with connection cache hit and miss rates for logical destinations and for physical endpoints. connection_cache_ttl_limit (default: 2s) The maximal time-to-live value that the scache(8) connection cache server allows. Requests that specify a larger TTL will be stored with the maximum allowed TTL. The purpose of this additional control is to protect the infrastructure against careless people. The cache TTL is already bounded by $max_idle. content_filter (default: empty) The name of a mail delivery transport that filters mail after it is queued. This parameter uses the same syntax as the right-hand side of a Postfix transport(5) table. This setting has a lower precedence than a content filter that is specified with an access(5) table or in a header_checks(5) or body_checks(5) table. cyrus_sasl_config_path (default: empty) Search path for Cyrus SASL application configuration files, currently used only to locate the $smtpd_sasl_path.conf file. Specify zero or more directories separated by a colon character, or an empty value to use Cyrus SASL’s built-in search path. This feature is available in Postfix 2.5 and later when compiled with Cyrus SASL 2.1.22 or later. daemon_directory (default: see postconf -d output) The directory with Postfix support programs and daemon programs. These should not be invoked directly by humans. The directory must be owned by root. daemon_timeout (default: 18000s) How much time a Postfix daemon process may take to handle a request before it is terminated by a built-in watchdog timer. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds). data_directory (default: see postconf -d output) The directory with Postfix-writable data files (for example: caches, pseudo-random numbers). This directory must be owned by the mail_owner account, and must not be shared with non-Postfix software. This feature is available in Postfix 2.5 and later. debug_peer_level (default: 2) The increment in verbose logging level when a remote client or server matches a pattern in the debug_peer_list parameter. debug_peer_list (default: empty) Optional list of remote client or server hostname or network address patterns that cause the verbose logging level to increase by the amount specified in $debug_peer_level. Specify domain names, network/netmask patterns, "/file/name" patterns or "type:table" lookup tables. The right-hand side result from "type:table" lookups is ignored. Pattern matching of domain names is controlled by the parent_domain_matches_subdomains parameter. Examples: debug_peer_list = 127.0.0.1 debug_peer_list = some.domain debugger_command (default: empty) The external command to execute when a Postfix daemon program is invoked with the -D option. Use "command .. & sleep 5" so that the debugger can attach before the process marches on. If you use an X-based debugger, be sure to set up your XAUTHORITY environment variable before starting Postfix. Example: debugger_command = PATH=/usr/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 default_database_type (default: see postconf -d output) The default database type for use in newaliases(1), postalias(1) and postmap(1) commands. On many UNIX systems the default type is either dbm or hash. The default setting is frozen when the Postfix system is built. Examples: default_database_type = hash default_database_type = dbm default_delivery_slot_cost (default: 5) How often the Postfix queue manager’s scheduler is allowed to preempt delivery of one message with another. Each transport maintains a so-called "available delivery slot counter" for each message. One message can be preempted by another one when the other message can be delivered using no more delivery slots (i.e., invocations of delivery agents) than the current message counter has accumulated (or will eventually accumulate - see about slot loans below). This parameter controls how often is the counter incremented - it happens after each default_delivery_slot_cost recipients have been delivered. The cost of 0 is used to disable the preempting scheduling completely. The minimum value the scheduling algorithm can use is 2 - use it if you want to maximize the message throughput rate. Although there is no maximum, it doesn’t make much sense to use values above say 50. The only reason why the value of 2 is not the default is the way this parameter affects the delivery of mailing-list mail. In the worst case, their delivery can take somewhere between (cost+1/cost) and (cost/cost-1) times more than if the preemptive scheduler was disabled. The default value of 5 turns out to provide reasonable message response times while making sure the mailing-list deliveries are not extended by more than 20-25 percent even in the worst case. Use transport_delivery_slot_cost to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. Examples: default_delivery_slot_cost = 0 default_delivery_slot_cost = 2 default_delivery_slot_discount (default: 50) The default value for transport-specific _delivery_slot_discount settings. This parameter speeds up the moment when a message preemption can happen. Instead of waiting until the full amount of delivery slots required is available, the preemption can happen when transport_delivery_slot_discount percent of the required amount plus transport_delivery_slot_loan still remains to be accumulated. Note that the full amount will still have to be accumulated before another preemption can take place later. Use transport_delivery_slot_discount to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. default_delivery_slot_loan (default: 3) The default value for transport-specific _delivery_slot_loan settings. This parameter speeds up the moment when a message preemption can happen. Instead of waiting until the full amount of delivery slots required is available, the preemption can happen when transport_delivery_slot_discount percent of the required amount plus transport_delivery_slot_loan still remains to be accumulated. Note that the full amount will still have to be accumulated before another preemption can take place later. Use transport_delivery_slot_loan to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. default_destination_concurrency_failed_cohort_limit (default: 1) How many pseudo-cohorts must suffer connection or handshake failure before a specific destination is considered unavailable (and further delivery is suspended). Specify zero to disable this feature. A destination’s pseudo-cohort failure count is reset each time a delivery completes without connection or handshake failure for that specific destination. A pseudo-cohort is the number of deliveries equal to a destination’s delivery concurrency. Use transport_destination_concurrency_failed_cohort_limit to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. This feature is available in Postfix 2.5. The default setting is compatible with earlier Postfix versions. default_destination_concurrency_limit (default: 20) The default maximal number of parallel deliveries to the same destination. This is the default limit for delivery via the lmtp(8), pipe(8), smtp(8) and virtual(8) delivery agents. With per-destination recipient limit > 1, a destination is a domain, otherwise it is a recipient. Use transport_destination_concurrency_limit to specify a transport- specific override, where transport is the master.cf name of the message delivery transport. default_destination_concurrency_negative_feedback (default: 1) The per-destination amount of delivery concurrency negative feedback, after a delivery completes with a connection or handshake failure. Feedback values are in the range 0..1 inclusive. With negative feedback, concurrency is decremented at the beginning of a sequence of length 1/feedback. This is unlike positive feedback, where concurrency is incremented at the end of a sequence of length 1/feedback. As of Postfix version 2.5, negative feedback cannot reduce delivery concurrency to zero. Instead, a destination is marked dead (further delivery suspended) after the failed pseudo-cohort count reaches $default_destination_concurrency_failed_cohort_limit (or $transport_destination_concurrency_failed_cohort_limit). To make the scheduler completely immune to connection or handshake failures, specify a zero feedback value and a zero failed pseudo-cohort limit. Specify one of the following forms: number number / number Constant feedback. The value must be in the range 0..1 inclusive. The default setting of "1" is compatible with Postfix versions before 2.5, where a destination’s delivery concurrency is throttled down to zero (and further delivery suspended) after a single failed pseudo-cohort. number / concurrency Variable feedback of "number / (delivery concurrency)". The number must be in the range 0..1 inclusive. With number equal to "1", a destination’s delivery concurrency is decremented by 1 after each failed pseudo-cohort. A pseudo-cohort is the number of deliveries equal to a destination’s delivery concurrency. Use transport_destination_concurrency_negative_feedback to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. This feature is available in Postfix 2.5. The default setting is compatible with earlier Postfix versions. default_destination_concurrency_positive_feedback (default: 1) The per-destination amount of delivery concurrency positive feedback, after a delivery completes without connection or handshake failure. Feedback values are in the range 0..1 inclusive. The concurrency increases until it reaches the per-destination maximal concurrency limit. With positive feedback, concurrency is incremented at the end of a sequence with length 1/feedback. This is unlike negative feedback, where concurrency is decremented at the start of a sequence of length 1/feedback. Specify one of the following forms: number number / number Constant feedback. The value must be in the range 0..1 inclusive. The default setting of "1" is compatible with Postfix versions before 2.5, where a destination’s delivery concurrency doubles after each successful pseudo-cohort. number / concurrency Variable feedback of "number / (delivery concurrency)". The number must be in the range 0..1 inclusive. With number equal to "1", a destination’s delivery concurrency is incremented by 1 after each successful pseudo-cohort. A pseudo-cohort is the number of deliveries equal to a destination’s delivery concurrency. Use transport_destination_concurrency_positive_feedback to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. This feature is available in Postfix 2.5 and later. default_destination_rate_delay (default: 0s) The default amount of delay that is inserted between individual deliveries to the same destination; with per-destination recipient limit > 1, a destination is a domain, otherwise it is a recipient. To enable the delay, specify a non-zero time value (an integral value plus an optional one-letter suffix that specifies the time unit). Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds). NOTE: the delay is enforced by the queue manager. The delay timer state does not survive "postfix reload" or "postfix stop". Use transport_destination_rate_delay to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. This feature is available in Postfix 2.5 and later. default_destination_recipient_limit (default: 50) The default maximal number of recipients per message delivery. This is the default limit for delivery via the lmtp(8), pipe(8), smtp(8) and virtual(8) delivery agents. Setting this parameter to a value of 1 changes the meaning of the corresponding per-destination concurrency limit from concurrency per domain into concurrency per recipient. Use transport_destination_recipient_limit to specify a transport- specific override, where transport is the master.cf name of the message delivery transport. default_extra_recipient_limit (default: 1000) The default value for the extra per-transport limit imposed on the number of in-memory recipients. This extra recipient space is reserved for the cases when the Postfix queue manager’s scheduler preempts one message with another and suddenly needs some extra recipients slots for the chosen message in order to avoid performance degradation. Use transport_extra_recipient_limit to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. default_minimum_delivery_slots (default: 3) How many recipients a message must have in order to invoke the Postfix queue manager’s scheduling algorithm at all. Messages which would never accumulate at least this many delivery slots (subject to slot cost parameter as well) are never preempted. Use transport_minimum_delivery_slots to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. default_privs (default: nobody) The default rights used by the local(8) delivery agent for delivery to external file or command. These rights are used when delivery is requested from an aliases(5) file that is owned by root, or when delivery is done on behalf of root. DO NOT SPECIFY A PRIVILEGED USER OR THE POSTFIX OWNER. default_process_limit (default: 100) The default maximal number of Postfix child processes that provide a given service. This limit can be overruled for specific services in the master.cf file. default_rbl_reply (default: see postconf -d output) The default SMTP server response template for a request that is rejected by an RBL-based restriction. This template can be overruled by specific entries in the optional rbl_reply_maps lookup table. This feature is available in Postfix 2.0 and later. The template is subject to exactly one level of $name substitution: $client The client hostname and IP address, formatted as name[address]. $client_address The client IP address. $client_name The client hostname or "unknown". See reject_unknown_client_hostname for more details. $reverse_client_name The client hostname from address->name lookup, or "unknown". See reject_unknown_reverse_client_hostname for more details. $helo_name The hostname given in HELO or EHLO command or empty string. $rbl_class The blacklisted entity type: Client host, Helo command, Sender address, or Recipient address. $rbl_code The numerical SMTP response code, as specified with the maps_rbl_reject_code configuration parameter. Note: The numerical SMTP response code is required, and must appear at the start of the reply. With Postfix version 2.3 and later this information may be followed by an RFC 3463 enhanced status code. $rbl_domain The RBL domain where $rbl_what is blacklisted. $rbl_reason The reason why $rbl_what is blacklisted, or an empty string. $rbl_what The entity that is blacklisted (an IP address, a hostname, a domain name, or an email address whose domain was blacklisted). $recipient The recipient address or <> in case of the null address. $recipient_domain The recipient domain or empty string. $recipient_name The recipient address localpart or <> in case of null address. $sender The sender address or <> in case of the null address. $sender_domain The sender domain or empty string. $sender_name The sender address localpart or <> in case of the null address. ${name?text} Expands to ‘text’ if $name is not empty. ${name:text} Expands to ‘text’ if $name is empty. Instead of $name you can also specify ${name} or $(name). Note: when an enhanced status code is specified in an RBL reply template, it is subject to modification. The following transformations are needed when the same RBL reply template is used for client, helo, sender, or recipient access restrictions. · When rejecting a sender address, the Postfix SMTP server will transform a recipient DSN status (e.g., 4.1.1-4.1.6) into the corresponding sender DSN status, and vice versa. · When rejecting non-address information (such as the HELO command argument or the client hostname/address), the Postfix SMTP server will transform a sender or recipient DSN status into a generic non-address DSN status (e.g., 4.0.0). default_recipient_limit (default: 20000) The default per-transport upper limit on the number of in-memory recipients. These limits take priority over the global qmgr_message_recipient_limit after the message has been assigned to the respective transports. See also default_extra_recipient_limit and qmgr_message_recipient_minimum. Use transport_recipient_limit to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. default_recipient_refill_delay (default: 5s) The default per-transport maximum delay between recipients refills. When not all message recipients fit into the memory at once, keep loading more of them at least once every this many seconds. This is used to make sure the recipients are refilled in timely manner even when $default_recipient_refill_limit is too high for too slow deliveries. Use transport_recipient_refill_delay to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. This feature is available in Postfix 2.4 and later. default_recipient_refill_limit (default: 100) The default per-transport limit on the number of recipients refilled at once. When not all message recipients fit into the memory at once, keep loading more of them in batches of at least this many at a time. See also $default_recipient_refill_delay, which may result in recipient batches lower than this when this limit is too high for too slow deliveries. Use transport_recipient_refill_limit to specify a transport-specific override, where transport is the master.cf name of the message delivery transport. This feature is available in Postfix 2.4 and later. default_transport (default: smtp) The default mail delivery transport and next-hop destination for destinations that do not match $mydestination, $inet_interfaces, $proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains, or $relay_domains. In order of decreasing precedence, the nexthop destination is taken from $default_transport, $sender_dependent_relayhost_maps, $relayhost, or from the recipient domain. This information can be overruled with the transport(5) table. Specify a string of the form transport:nexthop, where transport is the name of a mail delivery transport defined in master.cf. The :nexthop part is optional. For more details see the transport(5) manual page. Example:
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