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Date:  Sat, 10 Nov 2007 08:49:44 +0100
From:  =?UTF-8?Q?Tom_M=C3=BCller-Kortkamp?= <tmueko (at mark)>
Subject:  [coba-e:11131] Strange relay problems ...
To:  coba-e (at mark)
Message-Id:  <AB033695-B851-4F48-A924-F8A83E2BDC14 (at mark)>
X-Mail-Count: 11131

i found the following log entry:

Nov 10 02:05:01 gnom5 sendmail[3913]: lAA14tZ9003913:  
from=<Sdunaycef (at mark)>, size=27676, class=0, nrcpts=1,  
msgid=<2B34FADC.336B0E30 (at mark)>, proto=SMTP, daemon=MTA,  
relay=localhost [] (may be forged)
Nov 10 02:05:17 gnom5 sendmail[4450]: lAA14tZ9003913:  
to=wburmester (at mark), delay=00:00:19, xdelay=00:00:00,  
mailer=esmtp, pri=58770,  
[], dsn=5.7.1, stat=User unknown

none of them is my ip or domain ... but resolves to  
localhost ...

;; ANSWER SECTION: 78975 IN   PTR     localhost.

is this the trick (together with "localhost RELAY" in sendmail  
access)? I can't believe ...
how can i configure sendmail to stop that?