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For postfix, don't defer if "abused legit". (I.e., DBL return code in
the 127.0.1.100+ range.) This used to work for Postfix 3.1.14 (Stretch)
but for 3.4.8 (Buster) the 'defer_if_reject' also applies to
$smtpd_relay_restrictions, to reject_unauth_destination &
reject_unlisted_recipient in particular.
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On the infrastructure boundary. We don't reject/quarantine as it would
affect members who forward their mail sent to <user@example.com> to
<user@fripost.org>. Members can install Sieve rules to send any
messages with failed Authentication-Results headers directly in their
spambox.
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Unlike what we wrote in 2014 (cf. 4fb4be4d279dd94cab33fc778cfa318b93d6926f)
the postscreen(8) server can run chrooted, meaning we can also chroot
the smtpd(8), tlsproxy(8), dnsblog(8) and cleanup(8) daemons.
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These addresses need to be accepted on the MX:es, as recipients
sometimes phone back during the SMTP session to check whether the sender
exists.
Since a time-dependent suffix is added to the local part (cf.
http://www.postfix.org/postconf.5.html#address_verify_sender_ttl) it's
not enough to drop incoming mails to ‘double-bounce@fripost.org’, and
it's impractical to do the same for /^double-bounce.*@fripost\.org$/.
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‘noreply@’ aliases can be added by routing them to
‘@discard.fripost.org’.
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In particular, since Postfix is now able to perform LDAP lookups using
SASL, previous hacks with simble binds on cn=postfix,ou=services,… can
now be removed.
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So our suffix is now a mere 'dc=fripost,dc=org'. We're also using the
default '/var/lib/ldap' as olcDbDirectory (hence we don't clear it
before hand).
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'if $l' is false when $l is 0, while 0@example.org is a perfectly valid
address.
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It has to be performed last, to give a chance to be accepted as a
regular mailbox.
We introduce a new, dedicated, smtpd daemon whose only purpose is to
resolve catch-alls.
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Instead, we pretend that lists are valid users (via a match in the
mailbox_transport_maps) but choose a different transport (with the same
request in transport_maps).
The advantage is that we get rid of the ugly hack for list transport…
A minor drawback is that we now have two LDAP lookups instead of one for
non local addresses (ie, everything but reserved addresses). Hopefully
the requests are cached; but even if they aren't, querying a local LDAP
server is supposed to be cheap.
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Other abreviations are upper case.
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