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7ae4629a4a
79931051bd allows outgoing emails from
localhost, but outgoing recipients are still subjected to virtualmaps.
This caused all outgoing email from Zulip with destination addresses
containing `.`, `+`, or starting with `mm`, to be redirected back
through the email gateway.
Bracket the virualmap addresses used for local delivery to the mail
gateway with a restriction on the domain matching the
`postfix.mailname` configuration, regex-escaped, so those only apply
to email destined for that domain.
The hostname is _not_ moved from `mydestination` to
`virtual_alias_domains`, as that would preclude delivery to
actually-local addresses, like `postmaster@`.