Sendmail problem

[Paul Howarth]

Irving, Dave wrote:
> Hi,
> 
> I've set up a linux box to use at work, and Im having a little problem
> with sending mail.
> I have a standard FC3 install and am currently using DHCP to obtain an
> IP address.
> If I try to send an outgoing mail (e.g, echo "test" | mail
> irvingd at addr.com) , it seems to be accepted, but is never delivered.
> Here's the corresponding entries from my maillog:
> 
> Apr 19 09:48:37 nebular sendmail[4678]: j3J8mWUd004678: from=irvingd,
> size=44, class=0, nrcpts=1,
> msgid=<200504190848.j3J8mWUd004678 at localhost.localdomain>,
> relay=irvingd at localhost
> Apr 19 09:48:37 nebular sendmail[4679]: j3J8mbQj004679:
> from=<irvingd at localhost.localdomain>, size=355, class=0, nrcpts=1,
> msgid=<200504190848.j3J8mWUd004678 at localhost.localdomain>, proto=ESMTP,
> daemon=MTA, relay=localhost.localdomain [127.0.0.1]
> Apr 19 09:48:37 nebular sendmail[4678]: j3J8mWUd004678:
> to=irvingd at addr.com, ctladdr=irvingd (500/500), delay=00:00:05,
> xdelay=00:00:00, mailer=relay, pri=30044, relay=[127.0.0.1] [127.0.0.1],
> dsn=2.0.0, stat=Sent (j3J8mbQj004679 Message accepted for delivery)
> Apr 19 09:48:37 nebular sendmail[4681]: j3J8mbQj004679:
> to=<irvingd at addr.com>, ctladdr=<irvingd at localhost.localdomain>
> (500/500), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120355,
> relay=mail36.messagelabs.com. [193.109.254.211], dsn=2.0.0, stat=Sent
> (ok 1113900730 qp 20015
> server-13.tower-36.messagelabs.com!1113900729!16302711!1)
> 
> I suppose the odd thing here is the "irvingd at localhost.localdomain".
> I can send successfully from another linux box, the logs are pretty much
> identical (and the message is delivered). The only difference is that
> the from address has the full box address
> (from=<irvingd at somebox.co.uk>).
> 
> Could this be the reason why mail isn't going through?

Yes. There have been a few threads on this exact issue this week. Most 
mail servers will not accept mail from unresolvable domains like 
localhost.localdomain.

> Can anyone help me with any config changes I need to change to get
> outgoing mail working?

Make sure you have the sendmail-cf package installed and then look up 
"masquerading" in /usr/share/sendmail-cf/README

Paul.