Updated - I think I might have found the problem:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q240832 but if I set it to use HELO, I don't get the option for it to use EHLO, so I would lose the ability to send out as ESMTP?? Rob Ellis Network Manager Profectus IT Tel 023 9224 7960 Mob 07974 111867 -----Original Message----- From: Rob Ellis Sent: 26 September 2002 15:37 To: Exchange Discussions Subject: win2k sp2 smtp server error 5.0.0 Using a Win2K sp2 box in our DMZ running the MS smtp server, as a relay for our E2K server. All incoming traffic flows fine, but we are getting a number of NDRs such as: The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator. <mail.profectus.co.uk #5.0.0 smtp;500 Syntax error, command unrecognized> this is happening for a variety of domain names, including hotmail.com (which I'm not that worried about, but some of the domains are actually 'proper' domains.) Could it be that the IP that our server sits on has been blacklisted by certain ISPs? Rob Ellis Network Manager Profectus IT Tel 023 9224 7960 Mob 07974 111867 _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
