sendmail: local vs remote

I need help understanding which program is
responsible for determining where a mail
message goes. I've set up a fledgling
Slackware 3.0 box that I'm talking to over
TCP/IP with a Dos/Windows machine running
Winsock and Eudora Light. Assume that the
user names in question are windows and
linux.

If I compose a message on the Linux machine
addressed to user windows, I can connect
from the Windows machine to retrieve the
essage. However, if I compose a message
addressed to windows@domain.com, postmaster
receives a delivery failure that uux failed.


Conversely, if I compose a message on the
windows machine addressed to
linux@domain.com, postmaster receives the
same delivery failure.
jdunlopAsked:
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xtermCommented:
You need to tell sendmail to listen for domain.com

You should have a line like this in /etc/sendmail.cf:
Fw/etc/sendmail.cw

Then the contents of /etc/sendmail.cw would be:
domain.com
mail.domain.com
host.domain.com

(put all the likely ways people may address mail in that file)

Then kill & restart sendmail (sendmail -bd) and you're in
business
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