120 lines
5.0 KiB
Diff
120 lines
5.0 KiB
Diff
diff --git a/src/configure.default b/src/configure.default
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index 9242bac..eabf102 100644
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--- a/src/configure.default
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+++ b/src/configure.default
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@@ -119,6 +119,7 @@ hostlist relay_from_hosts = localhost
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# manual for details. The lists above are used in the access control lists for
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# checking incoming messages. The names of these ACLs are defined here:
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+acl_smtp_mail = acl_check_mail
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acl_smtp_rcpt = acl_check_rcpt
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.ifdef _HAVE_PRDR
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acl_smtp_data_prdr = acl_check_prdr
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@@ -395,6 +396,29 @@ timeout_frozen_after = 7d
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begin acl
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+
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+# This access control list is used for the MAIL command in an incoming
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+# SMTP message.
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+
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+acl_check_mail:
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+
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+ # Hosts are required to say HELO (or EHLO) before sending mail.
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+ # So don't allow them to use the MAIL command if they haven't
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+ # done so.
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+
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+ deny condition = ${if eq{$sender_helo_name}{} {1}}
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+ message = Nice boys say HELO first
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+
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+ # Use the lack of reverse DNS to trigger greylisting. Some people
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+ # even reject for it but that would be a little excessive.
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+
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+ warn condition = ${if eq{$sender_host_name}{} {1}}
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+ set acl_m_greylistreasons = Host $sender_host_address lacks reverse DNS\n$acl_m_greylistreasons
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+
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+ accept
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+
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+
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+
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# This access control list is used for every RCPT command in an incoming
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# SMTP message. The tests are run in order until the address is either
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# accepted or denied.
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@@ -520,7 +544,8 @@ acl_check_rcpt:
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# There are no default checks on DNS black lists because the domains that
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# contain these lists are changing all the time. However, here are two
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# examples of how you can get Exim to perform a DNS black list lookup at this
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- # point. The first one denies, whereas the second just warns.
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+ # point. The first one denies, whereas the second just warns. The third
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+ # triggers greylisting for any host in the blacklist.
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#
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# deny message = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
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# dnslists = black.list.example
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@@ -528,6 +553,10 @@ acl_check_rcpt:
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# warn dnslists = black.list.example
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# add_header = X-Warning: $sender_host_address is in a black list at $dnslist_domain
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# log_message = found in $dnslist_domain
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+ #
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+ # warn dnslists = black.list.example
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+ # set acl_m_greylistreasons = Host found in $dnslist_domain\n$acl_m_greylistreasons
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+ #
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#############################################################################
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#############################################################################
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@@ -554,6 +583,10 @@ acl_check_rcpt:
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# set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER}
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#############################################################################
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+ # Alternatively, greylist for it:
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+ # warn !verify = csa
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+ # set acl_m_greylistreasons = Host failed CSA check\n$acl_m_greylistreasons
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+
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# At this point, the address has passed all the checks that have been
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# configured, so we accept it unconditionally.
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@@ -612,6 +645,12 @@ acl_check_data:
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# deny condition = ${if !def:h_Message-ID: {1}}
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# message = RFC2822 says that all mail SHOULD have a Message-ID header.\n\
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# Most messages without it are spam, so your mail has been rejected.
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+ #
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+ # Alternatively if we're feeling more lenient we could just use it to
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+ # trigger greylisting instead:
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+
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+ warn condition = ${if !def:h_Message-ID: {1}}
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+ set acl_m_greylistreasons = Message lacks Message-Id: header. Consult RFC2822.\n$acl_m_greylistreasons
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# Deny if the message contains a virus. Before enabling this check, you
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# must install a virus scanner and set the av_scanner option above.
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@@ -658,8 +697,31 @@ acl_check_data:
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# message = Your message scored $spam_score SpamAssassin point. Report follows:\n\
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# $spam_report
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+ # Trigger greylisting (if enabled) if the SpamAssassin score is greater than 0.5
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+ #
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+ # warn condition = ${if >{$spam_score_int}{5} {1}}
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+ # set acl_m_greylistreasons = Message has $spam_score SpamAssassin points\n$acl_m_greylistreasons
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+
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+
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+ # If you want to greylist _all_ mail rather than only mail which looks like there
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+ # might be something wrong with it, then you can do this...
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+ #
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+ # warn set acl_m_greylistreasons = We greylist all mail\n$acl_m_greylistreasons
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+
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+ # Now, invoke the greylisting. For this you need to have installed the exim-greylist
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+ # package which contains this subroutine, and you need to uncomment the bit below
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+ # which includes it too. Whenever the $acl_m_greylistreasons variable is non-empty,
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+ # greylisting will kick in and will defer the mail to check if the sender is a
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+ # proper mail which which retries, or whether it's a zombie. For more details, see
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+ # the exim-greylist.conf.inc file itself.
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+ #
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+ # require acl = greylist_mail
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+
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accept
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+# To enable the greylisting, also uncomment this line:
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+# .include /etc/exim/exim-greylist.conf.inc
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+
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acl_check_mime:
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# File extension filtering.
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