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And drop -ldap from all roles other than MX. -lmdb is included in
roles/common but it can be helpful to have it individual roles as well
as they can be run individually.
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Cf. lmdb_table(5).
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Interhost communications are protected by stunnel4. The graphs are only
visible on the master itself, and content is generated by Fast CGI.
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We can therefore spare some lookups on the MDA, and use static:all
instead.
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First generate all certs (-t genkey), then build the TLS policy maps (
-t tls_policy).
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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 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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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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