It's the SMTP filter's response to an SMTP command it doesn't recognize; much like Scotty's ramblings about not being able to "get any more from 'er, Cap'n". Check your event logs for the specific command that it choked on. Jim Harrison MCP(2K), A+, Network+, PCG ----- Original Message ----- From: Kirk Poser To: [ISAserver.org Discussion List] Sent: Thursday, August 23, 2001 1:48 PM Subject: [isalist] Error 17220 http://www.ISAserver.org Has anyone run across this yet? In the event viewer, I am seeing this daily: Event ID 17220 "An unknown SMTP command" Source: smtpevt I am running ISA on a member server, and behind it on another server is Exchange 2000. I can't seem to find out any information on this error? Kapt Kirk kaptinkirk@xxxxxxx ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: kaptinkirk@xxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------------------------------ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com