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### main/02_exim4-config_options ################################# # Defines the access control list that is run when an # SMTP MAIL command is received. # .ifndef MAIN_ACL_CHECK_MAIL MAIN_ACL_CHECK_MAIL = acl_check_mail .endif acl_smtp_mail = MAIN_ACL_CHECK_MAIL # Defines the access control list that is run when an # SMTP RCPT command is received. # .ifndef MAIN_ACL_CHECK_RCPT MAIN_ACL_CHECK_RCPT = acl_check_rcpt .endif acl_smtp_rcpt = MAIN_ACL_CHECK_RCPT # Defines the access control list that is run when an # SMTP DATA command is received. # .ifndef MAIN_ACL_CHECK_DATA MAIN_ACL_CHECK_DATA = acl_check_data .endif acl_smtp_data = MAIN_ACL_CHECK_DATA # Message size limit. The default (used when MESSAGE_SIZE_LIMIT # is unset) is 50 MB .ifdef MESSAGE_SIZE_LIMIT message_size_limit = MESSAGE_SIZE_LIMIT .endif # If you are running exim4-daemon-heavy or a custom version of Exim that # was compiled with the content-scanning extension, you can cause incoming # messages to be automatically scanned for viruses. You have to modify the # configuration in two places to set this up. The first of them is here, # where you define the interface to your scanner. This example is typical # for ClamAV; see the manual for details of what to set for other virus # scanners. The second modification is in the acl_check_data access # control list. # av_scanner = clamd:/run/clamav/clamd.ctl # For spam scanning, there is a similar option that defines the interface to # SpamAssassin. You do not need to set this if you are using the default, which # is shown in this commented example. As for virus scanning, you must also # modify the acl_check_data access control list to enable spam scanning. # spamd_address = 127.0.0.1 783 # Domain used to qualify unqualified recipient addresses # If this option is not set, the qualify_domain value is used. # qualify_recipient = <value of qualify_domain> # Allow Exim to recognize addresses of the form "user@[10.11.12.13]", # where the domain part is a "domain literal" (an IP address) instead # of a named domain. The RFCs require this facility, but it is disabled # in the default config since it is rarely used and frequently abused. # Domain literal support also needs a special router, which is automatically # enabled if you use the enable macro MAIN_ALLOW_DOMAIN_LITERALS. # Additionally, you might want to make your local IP addresses (or @[]) # local domains. .ifdef MAIN_ALLOW_DOMAIN_LITERALS allow_domain_literals .endif # Do a reverse DNS lookup on all incoming IP calls, in order to get the # true host name. If you feel this is too expensive, the networks for # which a lookup is done can be listed here. .ifndef DC_minimaldns .ifndef MAIN_HOST_LOOKUP MAIN_HOST_LOOKUP = * .endif host_lookup = MAIN_HOST_LOOKUP .endif # The setting below causes Exim to try to initialize the system resolver # library with DNSSEC support. It has no effect if your library lacks # DNSSEC support. dns_dnssec_ok = 1 # In a minimaldns setup, update-exim4.conf guesses the hostname and # dumps it here to avoid DNS lookups being done at Exim run time. .ifdef MAIN_HARDCODE_PRIMARY_HOSTNAME primary_hostname = MAIN_HARDCODE_PRIMARY_HOSTNAME .endif # The settings below cause Exim to make RFC 1413 (ident) callbacks # for all incoming SMTP calls. You can limit the hosts to which these # calls are made, and/or change the timeout that is used. If you set # the timeout to zero, all RFC 1413 calls are disabled. RFC 1413 calls # are cheap and can provide useful information for tracing problem # messages, but some hosts and firewalls have problems with them. # This can result in a timeout instead of an immediate refused # connection, leading to delays on starting up SMTP sessions. # (The default was reduced from 30s to 5s for release 4.61. and to # disabled for release 4.86) # #rfc1413_hosts = * #rfc1413_query_timeout = 5s # Enable an efficiency feature. We advertise the feature; clients # may request to use it. For multi-recipient mails we then can # reject or accept per-user after the message is received. # This supports recipient-dependent content filtering; without it # you have to temp-reject any recipients after the first that have # incompatible filtering, and do the filtering in the data ACL. # Even with this enabled, you must support the old style for peers # not flagging support for PRDR (visible via $prdr_requested). prdr_enable = true # When using an external relay tester (such as rt.njabl.org and/or the # currently defunct relay-test.mail-abuse.org, the test may be aborted # since exim complains about "too many nonmail commands". If you want # the test to complete, add the host from where "your" relay tester # connects from to the MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS macro. # Please note that a non-empty setting may cause extra DNS lookups to # happen, which is the reason why this option is commented out in the # default settings. # MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS = !rt.njabl.org .ifdef MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS smtp_accept_max_nonmail_hosts = MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS .endif # By default, exim forces a Sender: header containing the local # account name at the local host name in all locally submitted messages # that don't have the local account name at the local host name in the # From: header, deletes any Sender: header present in the submitted # message and forces the envelope sender of all locally submitted # messages to the local account name at the local host name. # The following settings allow local users to specify their own envelope sender # in a locally submitted message. Sender: headers existing in a locally # submitted message are not removed, and no automatic Sender: headers # are added. These settings are fine for most hosts. # If you run exim on a classical multi-user systems where all users # have local mailboxes that can be reached via SMTP from the Internet # with the local FQDN as the domain part of the address, you might want # to disable the following three lines for traceability reasons. .ifndef MAIN_FORCE_SENDER local_from_check = false local_sender_retain = true untrusted_set_sender = * .endif # By default, Exim expects all envelope addresses to be fully qualified, that # is, they must contain both a local part and a domain. Configure exim # to accept unqualified addresses from certain hosts. When this is done, # unqualified addresses are qualified using the settings of qualify_domain # and/or qualify_recipient (see above). # sender_unqualified_hosts = <unset> # recipient_unqualified_hosts = <unset> # Configure Exim to support the "percent hack" for certain domains. # The "percent hack" is the feature by which mail addressed to x%y@z # (where z is one of the domains listed) is locally rerouted to x@y # and sent on. If z is not one of the "percent hack" domains, x%y is # treated as an ordinary local part. The percent hack is rarely needed # nowadays but frequently abused. You should not enable it unless you # are sure that you really need it. # percent_hack_domains = <unset> # Bounce handling .ifndef MAIN_IGNORE_BOUNCE_ERRORS_AFTER MAIN_IGNORE_BOUNCE_ERRORS_AFTER = 2d .endif ignore_bounce_errors_after = MAIN_IGNORE_BOUNCE_ERRORS_AFTER .ifndef MAIN_TIMEOUT_FROZEN_AFTER MAIN_TIMEOUT_FROZEN_AFTER = 7d .endif timeout_frozen_after = MAIN_TIMEOUT_FROZEN_AFTER .ifndef MAIN_FREEZE_TELL MAIN_FREEZE_TELL = postmaster .endif freeze_tell = MAIN_FREEZE_TELL # Define spool directory .ifndef SPOOLDIR SPOOLDIR = /var/spool/exim4 .endif spool_directory = SPOOLDIR # trusted users can set envelope-from to arbitrary values .ifndef MAIN_TRUSTED_USERS MAIN_TRUSTED_USERS = uucp .endif trusted_users = MAIN_TRUSTED_USERS .ifdef MAIN_TRUSTED_GROUPS trusted_groups = MAIN_TRUSTED_GROUPS .endif # users in admin group can do many other things # admin_groups = <unset> # SMTP Banner. The example includes the Debian version in the SMTP dialog # MAIN_SMTP_BANNER = "${primary_hostname} ESMTP Exim ${version_number} (Debian package MAIN_PACKAGE_VERSION) ${tod_full}" # smtp_banner = $smtp_active_hostname ESMTP Exim $version_number $tod_full .ifdef MAIN_KEEP_ENVIRONMENT keep_environment = MAIN_KEEP_ENVIRONMENT .else # set option to empty value to avoid warning. keep_environment = .endif .ifdef MAIN_ADD_ENVIRONMENT add_environment = MAIN_ADD_ENVIRONMENT .endif .ifdef _OPT_MAIN_SMTPUTF8_ADVERTISE_HOSTS .ifndef MAIN_SMTPUTF8_ADVERTISE_HOSTS MAIN_SMTPUTF8_ADVERTISE_HOSTS = .endif smtputf8_advertise_hosts = MAIN_SMTPUTF8_ADVERTISE_HOSTS .endif