Sep 19 06:48:49 mx0 postfix/smtpd[17545]: NOQUEUE: reject: RCPT from server1.example.com[10.1.2.137]: 554 5.7.1 <logcheck@server1.example.com>: Sender address rejected: forged mail; from=<logcheck@server1.example.com> to=<etbe@example.com> proto=ESMTP helo=<server1.example.com> I have two servers with consecutive IP addresses named server0 and server1. They both try to send mail to my mail server, when I have a cron job or swaks send mail server1's mail is rejected with messages like the above and server0 mail goes through. The forward and reverse DNS entries all look to be good and the SPF entry is also correct. Does anyone have any suggestions for where to look in Postfix configuration to determine what the problem might be? A Google search didn't turn up any exact matches for the error message and no close matches that were useful. As an aside it would be really handy if the authors of complex software could make a web site mapping log messages to conditions that cause them. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/