Hi, everyone: I have a web interface for users to subscribe to my list. After user hit submit, a perl cgi script kick off and use unix sendmail to send subscribtion to my listserv. Since the list has "subscription=open,Confirm", most users just send ok to the reply and they are in. However some users are complaining about when they reply an ok message, they got: The confirmation code you gave (0A5476) does not correspond to any pending command.... What might cause this problem? Is there a solution to it? Thanks George Tsai