I'm running sendmail 8.8.6 on a Slackware Linux box which is serving as a mail server (i.e. several DNS MX records) for multiple domains. All has been fine in the setup for some time.
I've now run into a situation that needs some help. Currently, the usernames are common between the different domains served. For example, firstname.lastname@example.org is equivalent to email@example.com and so on. They both end up in the mail inbox for john on the server.
The need now is to be able to map each of the above to DIFFERENT mail boxes on the server. So:
firstname.lastname@example.org --> Maps to john_a
email@example.com --> Maps to john_b
(BTW, please don't supply answers using the M4 configuration for sendmail.cf. It's too cryptic and we don't use it.)