Can you post the rest of the NDR? How about a protocol log of the SMTP transaction? What response was expected that wasn't received would be of interest. Turning off ESMTP on your end (in the metabase) would prevent you from advertising it. Did you remember to turn off sending the request? Al -----Original Message----- From: Sean Winters [mailto:sean@xxxxxxxxxxxxxxxx] Sent: Sunday, September 28, 2003 5:48 PM To: [ExchangeList] Subject: [exchangelist] Help with NDR http://www.MSExchange.org/ I am working with a relatively new Ex2K build and have had two different external contacts report intermittent NDR's. There is no PIX firewall in place and ESMTP verbs have been disabled on our end. The NDR is "4.4.1 Did not receive the expected protocol response." Searching the usual sources has turned up nothing. Any ideas/suggestions? ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: al.mulnick@xxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')