I have sent a message with a typo in the sender's e-mail, and get back a 550..Address Not Valid and also a response 554 ...Service Unavailable. I have an open socket which shows syn_sent. It appears sendmail is hung, and if I just restart it, I get the same situation. What could be causing sendmail to die and how to I clear the problem without killing the mqueue entries. I don't want to kill the files since this was a group mailing, of which some of the sends succeeded, and the others have yet to be sent. Fred -- To unsubscribe: mail [EMAIL PROTECTED] with "unsubscribe" as the Subject.