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Following Viktor Dukhovni's 2015-08-06 recommendation for Postfix >= 2.11
http://article.gmane.org/gmane.mail.postfix.user/251935
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Ideally we we should also increase the Diffie-Hellman group size from
2048-bit to 3072-bit, as per ENISA 2014 report.
https://www.enisa.europa.eu/publications/algorithms-key-size-and-parameters-report-2014
But we postpone that for now until we are reasonably certain that older
client won't be left out.
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cert itself.
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Put all relay restrictions under smtpd_relay_restrictions and leave
smtpd_recipient_restrictions empty, since we don't do DNSBL.
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We already removed it from the MX:es (see 32e605d4); we need to remove
it from the MDA and outgoing SMTP as well, otherwise mails could bounce
or get stuck in the middle (the're rejected with 450: deferred by
default).
However we can keep the restriction on the entry points (MSA and
webmail).
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On the MDA the domain is our 'mda.fripost.org', there is no need to
perform an extra DNS lookup.
The MSA does not perform local or virtual delivery, but relays
everything to the outgoing SMTP proxy.
On the MX, there is no need to check for recipient validity as we are
the final destination; but unsure that the RCPT TO address is a valid
recipient before doing the greylisting.
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We can therefore spare some lookups on the MDA, and use static:all
instead.
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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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For DKIM signing and virus checking.
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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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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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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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