----- Original Message ----- From: "David Christian" <dchristian at users.sourceforge.net> To: <tclug-list at mn-linux.org> Sent: Friday, June 29, 2001 16:10 Subject: [TCLUG] Sendmail and DSL > I can't seem to send mail from Linux using mutt and sendmail. The linux > machine is on LAN behind behind a Router, and so doesn't have a valid IP > address or domain name. > > Does anyone know how to configure sendmail so that the various MTAs out > there will believe me about who I am? Do I somehow need to relay to > Qwest.net's mail router? > > Here is a sample message I got back from NCSU: > > ----- The following addresses had permanent fatal errors ----- > rousseau at csc.ncsu.edu > (reason: 501 <dchristi at goliath.qwest.net>... Sender domain must exist) *Runs screaming in terror* The last time I saw this error I was led into the bowels of sendmail.cf and the rewrite rules... I certainly hope someone out there has a better solition, or a firmer understanding of the one I was forced to use anyway. The problem is that the receiving mail server looks at "goliath.qwest.net" and tries to do a lookup on it to make sure it's a valid domain. Since it's a machine name within the qwest.net domain (I'm assuming) it naturally doesn't find it. I ended up configuring sendmail to strip the hostname portion of the sender address and fixed it that way - but I'm not a mail admin and I'm pretty sure that was the wrong way to correct the problem.