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### main/02_exim4-config_options
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#################################
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# This option defines the access control list that is run when an
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# SMTP RCPT command is received.
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acl_smtp_rcpt = acl_check_rcpt
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# This option defines the access control list that is run when an
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# SMTP DATA command is received.
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acl_smtp_data = acl_check_data
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# If you want unqualified recipient addresses to be qualified with a different
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# domain to unqualified sender addresses, specify the recipient domain here.
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# If this option is not set, the qualify_domain value is used.
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# The following line must be uncommented if you want Exim to recognize
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# addresses of the form "user@[10.11.12.13]" that is, with a "domain literal"
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# (an IP address) instead of a named domain. The RFCs still require this form,
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# but it makes little sense to permit mail to be sent to specific hosts by
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# their IP address in the modern Internet. This ancient format has been used
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# by those seeking to abuse hosts by using them for unwanted relaying. If you
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# really do want to support domain literals, uncomment the following line, and
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# see also the "domain_literal" router.
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# allow_domain_literals
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# The setting below causes Exim to do a reverse DNS lookup on all incoming
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# IP calls, in order to get the true host name. If you feel this is too
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# expensive, you can specify the networks for which a lookup is done, or
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# remove the setting entirely.
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# The settings below, which are actually the same as the defaults in the
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# code, cause Exim to make RFC 1413 (ident) callbacks for all incoming SMTP
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# calls. You can limit the hosts to which these calls are made, and/or change
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# the timeout that is used. If you set the timeout to zero, all RFC 1413 calls
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# are disabled. RFC 1413 calls are cheap and can provide useful information
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# for tracing problem messages, but some hosts and firewalls have problems
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# with them. This can result in a timeout instead of an immediate refused
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# connection, leading to delays on starting up an SMTP session.
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rfc1413_query_timeout = 30s
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# By default, Exim expects all envelope addresses to be fully qualified, that
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# is, they must contain both a local part and a domain. If you want to accept
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# unqualified addresses (just a local part) from certain hosts, you can specify
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# these hosts by setting one or both of
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# sender_unqualified_hosts =
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# recipient_unqualified_hosts =
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# to control sender and recipient addresses, respectively. When this is done,
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# unqualified addresses are qualified using the settings of qualify_domain
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# and/or qualify_recipient (see above).
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# If you want Exim to support the "percent hack" for certain domains,
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# uncomment the following line and provide a list of domains. The "percent
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# hack" is the feature by which mail addressed to x%y@z (where z is one of
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# the domains listed) is locally rerouted to x@y and sent on. If z is not one
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# of the "percent hack" domains, x%y is treated as an ordinary local part. This
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# hack is rarely needed nowadays; you should not enable it unless you are sure
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# that you really need it.
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# percent_hack_domains =
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# When Exim can neither deliver a message nor return it to sender, it "freezes"
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# the delivery error message (aka "bounce message"). There are also other
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# circumstances in which messages get frozen. They will stay on the queue for
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# ever unless one of the following options is set.
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# This option unfreezes frozen bounce messages after two days, tries
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# once more to deliver them, and ignores any delivery failures.
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ignore_bounce_errors_after = 2d
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# This option cancels (removes) frozen messages that are older than a week.
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timeout_frozen_after = 7d
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freeze_tell = postmaster
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# uucp should be able to set envelope-from to arbitrary values
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# uncomment this to get the Debian version in the SMTP dialog
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# smtp_banner = "${primary_hostname} ESMTP Exim ${version_number} (Debian package DEBCONFpackageversionDEBCONF) ${tod_full}"