spi via Postfix-users:
> Hi all
>
> My users have a local mail address user@internal.local with different
> aliases (virtual_mailbox_maps, virtual_alias_maps). Receiving and
> sending mails through different relay hosts (am using
> sender_dependent_relayhost_maps) works without issues. As MDA I use
> dovecot with lmtp transport.
>
> Recently I stumbled across an issue with dovecot's sieve vacation plugin:
>
> A user with the alias a...@external.com (and the internal mail address
> a@internal.local) receives an email and the sieve vacation plugin is
> supposed to reply with an out of office message. RFC 5230 suggests that
> ooo replies are sent with an empty SMTP MAIL FROM address.
>
> Sieve vacation creates an ooo reply with an empty MAIL FROM which then
> postfix tries to deliver directly to the receiving MX - which in my case
> ignores my relay hosts and therefore fails.
>
> I can make sieve vacation use a MAIL FROM address which then violates
> RFC 5230 - but this works only for users without virtual aliases (they
> need their @external.com be their mailbox address and not the
> @internal.local one - otherwise the reply is sent by user@internal.local
> which also doesn't work).
>
>
> I can't get sieve vacation work and was looking for postfix to somehow
> use header_checks and FILTER to choose a relay host for ooo replies but
> couldn't figure it out yet - any help would be highly appreciated.
Indeed, a FILTER action takes precedence over other Postfix routing
mechansms.
You'd use a rule like:
Key Value
=== ===================
pattern FILTER smtp:nexthop
Where 'nexthop' equals the sender_dependent_relayhost_maps info for
the auto-responding user. The tricky part is the 'pattern'.
Wietse
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