Phil Howard:
> I'd like to do something like this. I have a domain, let's call
> example.com. This domain has a set of users. I want to have email
> accepted for any user in any hostname that is a part of this domain.
> And, regardless of which hostname in this domain was involved, if the
> user doesn't exist, the RCPT command should be rejected. This would
> correspond to using a wildcard (e.g. a * label) in DNS for the zone
> for that domain. The ability to make exceptions for this (e.g. a
> special hostname in the domain handled differently) would be a plus,
> but not essential. It seems what I need is some kind of RCPT command
> time rewrite.
Postfix supports wildcards via regexp/pcre tables.
1) You can use them for all the tables that define Postfix address
classes: mydestination + aliases, virtual_alias_domains +
virtual_alias_maps, virtual_mailbox_domains + virtual_mailbox_maps,
relay_domains + relay_recipient_maps.
Simply replacing one domain name by another does not produce the
expected result.
2) Postfix 2.7 supports SMTP command rewriting (smtpd_command_filter)
However this would produce an incorrect error message:
RCPT TO:<u...@foo.example.com>
smtpd_command_filter strips this to ``RCPT TO:<u...@example.com>''
The Postfix SMTP server then responds with:
550 5.1.1 <u...@example.com> User unknown
Wietse
