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Unlike adduser(8), ansible's 'user' module copies skeletal configuration
files even for system users (unless called with createhome=no).
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The reason is that we don't want to rely on CAs to verify the
certificate of our server. Dovecot currently doesn't offer a way to
match said cert against a local copy or known fingerprint. stunnel
does.
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For some reason giraff doesn't like IPSec. App-level TLS sessions are
less efficient, but thanks to ansible it still scales well.
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This is required for dbox, see
http://wiki2.dovecot.org/MailboxFormat/dbox#Multi-dbox
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This ensures that Dovecot won't deliver messages if the disk hasn't been
mounted, for instance.
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Which might be caused by slow LDAP lookups in transport_maps. Instead,
we alias each addresses for which we want a custom transport to a
dedicated "dummy" domain, and use a static (CDB) transport_maps to map
said domains to their transport; the receiver can then use canonical(8)
to restore the original envelope recipient. Since the alias resolution
is performed by cleanup(8), which can run in parallel with other
instances, it should decongestion bottlenecks under heavy loads.
So far only the MX:es have been decongestioned. The list manager and
the MDA should be treated as well.
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That is, don't put a leading virtual_ or a trailing _maps in file names.
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Also, add the 'managesieve' RoundCube plugin to communicate with our
server.
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See /usr/share/doc/spamassassin/README.Debian.gz
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Mails to be retrained are stored in the spooldir /home/mail/spamspool;
later a daemon catches them up and feed them to sa-learn(1p). (On busy
systems batch-process the learning should be much more efficient.)
The folder transisition matrix along with the corresponding actions can
be found there:
http://hg.dovecot.org/dovecot-antispam-plugin/raw-file/5ebc6aae4d7c/doc/dovecot-antispam.7.txt
See also dovecot-antispam(7).
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Using dovecot's 'virtual' plugin, cf.
http://wiki2.dovecot.org/Plugins/Virtual
The 'virtual/' namespace is visible in the NAMESPACE command
(hidden=no), but not in LIST (list=no). This should ensure that the
namespace isn't automatically synced by offlineimap, but nevertheless
visible by roundcube, cf.
http://trac.roundcube.net/ticket/1486796
http://mailman2.u.washington.edu/pipermail/imap-protocol/2010-May/001076.html
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Antispam & antivirus, using ClamAV and SpamAssassin through Amavisd-new.
Each user has his/her amavis preferences, and own Bayes filter (to
maximize privacy).
One question remains, though: how to set spamassassin's trusted_networks
/ internal_networks / msa_networks? It seems not obivious to get it
write with IPSec and dynamic IPs.
(Cf. https://wiki.apache.org/spamassassin/AwlWrongWay)
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(For now, only LMTP and IMAP processes, without replication.)
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