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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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Also, it's now possible to reuse an existing private key (with -f).
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SMTP client connection caching was introduced in 2.6.0: the SMTP session is
held for the next task (in adaptative mode, only when there was a delay of only
5s between the two previous mails), but Postfix will terminate it if the next
mail doesn't come soon enough, or if amavis does't terminate it itself (usually
after 15s).
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(Unless a new instance is created, or the master.cf change is modified.)
Changing some variables, such as inet_protocols, require a full restart,
but most of the time it's overkill.
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And don't restart or reload either upon change of pcre: files that are
used by smtpd(8), cleanup(8) or local(8), following the suggestion from
http://www.postfix.org/DATABASE_README.html#detect .
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For DKIM signing and virus checking.
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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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In 2.1.7 they are buggy, and make Dovecot crash (when connected through
Evolution for instance). They have improved a lot since, though:
http://hg.dovecot.org/dovecot-2.2/file/c55c660d6e9d/NEWS
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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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So we set 'first_valid_uid' to 1, to accept any UID.
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Interesting features include caching of mail headers (v2.2.8+) as well
as new IMAP capabilities.
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E.g., ldap.fripost.org, ntp.fripost.org, etc. (Ideally the DNS zone
would be provisioned by ansible, too.) It's a bit unclear how to index
the subdomains (mx{1,2,3}, etc), though.
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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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We introduce a limitation on the domain-aliases: they can't have
children (e.g., lists or users) any longer.
The whole alias resolution, including catch-alls and domain aliases, is
now done in 'virtual_alias_maps'. We stop the resolution by returning a
dummy alias A -> A for mailboxes, before trying the catch-all maps.
We're still using transport_maps for lists. If it turns out to be a
bottleneck due to the high-latency coming from LDAP maps, (and the fact
that there is a single qmgr(8) daemon), we could rewrite lists to a
dummy subdomain and use a static transport_maps instead:
virtual_alias_maps:
mylist@example.org -> mylist#example.org@mlmmj.localhost.localdomain
transport_maps:
mlmmj.localhost.localdomain mlmmj:
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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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Also, add the 'managesieve' RoundCube plugin to communicate with our
server.
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RoundCubes lists subscribed mailboxes only (determined using
LIST-EXTENDED by default); also, it seems to ignore new subscriptions to
mailboxes not listed by the LIST command.
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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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Other abreviations are upper case.
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(For now, only LMTP and IMAP processes, without replication.)
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