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We don't want to bounce messages for which the recipient(s)' MTA replies
451 due to some greylisting in place. We would like to accept 451
alone, but unfortunately it's not possible to bounce unverified
recipients due to DNS or networking errors.
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This is specially useful for mailing lists and the webmail, since it
prevents our outgoing gateway from accepting mails known to be bouncing.
However the downside is that it adds a delay of up to 6s after the
RCPT TO command.
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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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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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