I have seen it. It means the server is seeing a null sender or is trying to do address verification. We have had the NULL sender problem with misconfigured windows PHP installations.
Kevin Bilbee > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Bill Puetz > Sent: Sunday, May 14, 2006 1:35 PM > To: Imail_Forum@list.ipswitch.com > Subject: [IMail Forum] Admin@ account blocked > > > A lot of our mail goes out with addresses from admin@ > whatever the domain > is. Someone just registered on our site from the European > Space Agency and > our registration confirmation message was blocked with the following > message: > > Diagnostic code: smtp;503 5.0.0 AntiSpam: Please use a real > email address, > the user admin@ is blocked. > > Has anyone seen this before? It seems like a very strange spam rule. > > Bill > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: > http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
