Sendmail Error - Rejected after DATA: could not verify "From:" header address"

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http://www.linuxquestions.org – 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=[email protected], ctladdr=<[email protected]> (0/0), delay=00:13:06, xdelay=00:00:45, mailer=relay, pri=210540, relay=smtp.isdsl.net. [], dsn=4.0.0, stat=Deferred: 451-Rejected after DATA: could not verify "From:" header address No matter what i (HowTos)