Hi all, I have spent three days on this and am at my end so help would be greatly appreciated. I have a server running CentOS 5.5 and Sendmail 8.13.8. All works fine except for emails from Logwatch. I see this in the maillog:

Jul 20 07:49:24 ifsboss sendmail[1027]: o6K5aIc0000515: to=system@soswebs.co.za, ctladdr=<root@ifsboss.ifsdbn.co.za> (0/0), delay=00:13:06, xdelay=00:00:45, mailer=relay, pri=210540, relay=smtp.isdsl.net. [196.26.208.197], dsn=4.0.0, stat=Deferred: 451-Rejected after DATA: could not verify "From:" header address

No matter what i have done It still fails on this. To list what I have done is plenty so I thought I'd poll you experts for possible past experience that could either confirm I am on the right track, or point me to it.

If I try force the mail that is stalled in the mailq I see this:

Running /var/spool/mqueue/o6I22Exm009672 (sequence 1 of 1)
<gary@soswebs.co.za>,system@soswebs.co.za... Connecting to smtp.isdsl.net. via relay...
220 smtp01.isdsl.net ESMTP Exim 4.69 Tue, 20 Jul 2010 07:53:28 +0200
>>> EHLO ifsboss.ifsdbn.co.za
250-smtp01.isdsl.net Hello 196-209-92-253.dynamic.isadsl.co.za [196.209.92.253]
250-SIZE 104857600
250-8BITMIME
250-EXPN
250 HELP
>>> MAIL From:<root@ifsboss.ifsdbn.co.za> SIZE=126181
250 OK
>>> RCPT To:<gary@soswebs.co.za>
250 Accepted
>>> RCPT To:<system@soswebs.co.za>
250 Accepted
>>> DATA
354 Enter message, ending with "." on a line by itself
>>> .
451-Rejected after DATA: could not verify "From:" header address
451-logwatch@ifsboss.ifsdbn.co.za: could not connect to ifsboss.ifsdbn.co.za
451 [41.185.12.60]: Operation timed out
<gary@soswebs.co.za>,system@soswebs.co.za... Deferred: 451-Rejected after DATA: could not verify "From:" header address
Closing connection to smtp.isdsl.net.
>>> QUIT
221 smtp01.isdsl.net closing connection

Always that "could not verify "From:" header address". In this case the from address is:

>>> MAIL From:<root@ifsboss.ifsdbn.co.za>

Which is a accepted address as it is mapped:

ifsdbn.co.za@ifsdbn.co.za : Address ifsdbn.co.za

ifsdbn.co.za is acceptable as all the users mail addresses are @ifsdbn.co.za and they all work.

What am I missing?

Thanks,
Roger

Hi,

I guess that the remote smtp does not like the sender address (root@ifsboss.ifsdbn.co.za). You see @ifsboss.ifsdbn.co.za is different from @ifsdbn.co.za
You can either use masquerade also for root, or if it's possible configure logwatch to use a valid sender address (like xxx@ifsdbn.co.za)

Regards

Thanks for the reply bathory, it is appreciated. I have managed to get this resolved by editing the /etc/mail/sendmail.mc file to masquerade as the correct domain as follows:

dnl # Also accept email sent to "localhost.localdomain" as local email.
dnl #
LOCAL_DOMAIN(`ifsdbn.co.za')dnl
dnl #
dnl # The following example makes mail from this host and any additional
dnl # specified domains appear to be sent from mydomain.com
dnl #
MASQUERADE_AS(`ifsdbn.co.za')dnl
dnl #
dnl # masquerade not just the headers, but the envelope as well
dnl #
FEATURE(masquerade_envelope)dnl