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Quoting postconf(5):
smtpd_reject_unlisted_recipient (default: yes)
Request that the Postfix SMTP server rejects mail for unknown recipient
addresses, even when no explicit reject_unlisted_recipient access
restriction is specified. This prevents the Postfix queue from filling
up with undeliverable MAILER-DAEMON messages.
An address is always considered "known" when it matches a virtual(5)
alias or a canonical(5) mapping.
[…]
* The recipient domain matches $virtual_alias_domains but the recipient
is not listed in $virtual_alias_maps.
* The recipient domain matches $virtual_mailbox_domains but the
recipient is not listed in $virtual_mailbox_maps, and
$virtual_mailbox_maps is not null.
Since we alias everything under special, "invalid", domains (mda.f.o and
mailman.f.o), our $virtual_mailbox_maps was null, which led to
reject_unlisted_recipient not being triggered for say, "noone@fripost.org".
However, replacing $virtual_mailbox_domains with $virtual_alias_domains fits
into the second point above.
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We can therefore spare some lookups on the MDA, and use static:all
instead.
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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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