There was a question about open relays asked previously.
I have a new CentOS 6 server handling multiple domains for several customers.
On the previous server (which was running CentOS 4), I had sendmail configured to handle incoming mail for several domains.
The goal is to replicate the old functionality on the new server - but my experience with administering mail is limited.
Ideally, I want a given mailbox to be addressable via any of the allowed domains. Eg
firstname.lastname@example.org should be the same inbox (since the user exists on the same server).
Ultimately, I anticipate we will be splitting mail and web traffic, but the traffic demands just aren't that high yet.
How can postfix be configured to handle multiple incoming domains for the same mailboxes?