I have a mail server that currently answers to one domain. I think I can make it work for two quite easily by adding another domain name in the /etc/mail/local-host-names directory. However, there is one thing that I can't figure out how to do...

My username on my mail server is gauge. My domain is ash-can.com. Clearly, my email address is gauge@ash-can.com. However, I don't want an address on this new domain that I'm adding to my server (which we'll call newdomain.com). So, I want gauge@ash-can.com to exist without being the same as gauge@newdomain.com. How can I make this happen? How can I keep the accounts for these domains separate, but on the same machine?

See the sendmail documentation on "virtusertable" to map parts of e-mail addresses to accounts, aliases, other e-mail addresses etc.

sendmail.mc...
FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')
e.g. virtusertable...
user1@example1.com localuser1
user1@example2.com localuser2
user2@example1.com user@somewhere.else

EDIT: Nevermind, I understand now. Thanks for the advice!

Pardon my jumping in on this, but I have a related dumb question:

Say I have a user "pat" on my machine, and can get email just fine at "pat@domain". Now, say I don't want my various email clients to login to my IMAP server using this user's username/password (since I may be logging in from my work machine, from a friend's machine, etc. and don't want to risk someone picking up that password via keylogger software or something), and instead want to set up an "email only" user, say "patmail", whose sole reason for existence would be to have an email account on my machine, so that I would login to THAT user with my email clients to check email. In order to have email to "pat@domain" be deposited in the "patmail" inbox, would I need to set up an alias or virtuser or something in Sendmail to do that?

If there's a different/better way to do what I'm trying to do (or some documentation addressing this scenario), please let me know. I've done several searches along the lines of "email only user", etc. but haven't seen anything that seems to be related to this.

Thanks,

It still won't get round the key-logging, but separating your e-mail and login accounts might be worth doing. At worst, your e-mail could be accessed.

There are a numbr of ways to set up e-mail only accounts from simple, dummy, nologin users and an alias thru to Cyrus IMAP. You might want to take a look at squirrelmail for web-based e-mail. Or, check to see what authentication methods your IMAP server supports - may be able to use a differnet password database for IMAP connections based on DIGEST etc. which is much more secure.

Ok. My next step IS squirrelmail now that I've got my IMAP/POP up and running (I've had Apache/PHP/MySQL running for quite some time), so I'll definitely be looking into options there.

Thanks for the info