Sendmail relaying question?

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http://forums.fedoraforum.org – I'm running Sendmail 8.14.1/8.13.8 on host mail.realdomain and 8.14.5/8.14.5 on mailhost-1.realdomain The former is Fedora and the latter 3.6.11-1.fc17.i686.PAE When relaying from mailhost-1.realdomain to mail.realdomain I see the following 4 consecutive messages in /var/log/maillog on the server mail.realdomain: ruleset=check_mail, arg1=<brad@mydomain>, relay=mailhost-1.realdomain [], reject=553 5.1.8 <brad@mydomain>... Domain of sender address brad@mydomain does not exist from=<brad@mydomain>, size=656, class=0, nrcpts=0, proto=ESMTP, d (HowTos)