Akshay Pushparaj via Postfix-users:
>
>
> >> I would like to know if i can configure postfix to forward mails if user
> >> not found in local recipient table.
> >
> > That is possible (with static: mapping) but not a good idea.
> May i know why it's not a good idea?
Forwarding ALL recipients not in the local recipient table will
make your server a source of backscatter mail (accept spam from an
innocent sender address to a non-existent recipient, then return
the mail as undeliverable).
> >> Users are split between LDAP in my server and a remote server for
> >> example.com. So if u...@example.com is not present in LDAP it must
> >> forward to remote server.
> >
> > How would Postfix know that the address is valid? If your answer
> > is: return the message to the sender if ther recipient is not valid,
> > then that is the wrong reply.
> I would have to use a static map of valid addresses, otherwise the mail
> would loop between 2 servers.
You have changed the problem from "forward ALL recipients not
in the local recipient table" to "forward SPECIFIC recipients".
The latter can be done with virtual_alias_maps.
/etc/postfix/main.cf
myorigin = example.com
virtual_alias_maps = hash:/etc/postfix/virtual
# NOT: virtual_alias_domains = example.com
/etc/postfix/virtual
f...@example.com foo@other.example
b...@example.com bar@other.example
This ensures that Postfix accepts only mail for 'valid" recipients.
Wietse
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