I'm using webmin on a Storm Debian 2.2 installation to set up sendmail
parameters.  I can send mail out, but when I send it into the server, I get an
error from my ISP telling me that the addresses were bad and that relaying
isn't supported.

What should I put in the aliases box to get it to accept things properly?
Right now, it only contains

localhost.


It shows something like 'mydomain.mydomain.com', which seems odd to me.  Why
is the domain name duplicated?

Where do I set up 'mail.domain.com'?

Also, I've got a few different user-ids on this box.  How do I set things up
so that non-matching user-ids are all routed to one of them?

I understand that sendmail is a rather large and complex beast, but all the
docs and books I've seen are trivial in their descriptions of parameters.  Can
anybody point me to something that contains some fairly "typical" use case
examples?

Thanks, and Happy New Year's to everyone!
-David Schwartz