I was told that you all might be able to help me. I have a client that has Exchange running on one box and listserv running on another box. We are using IIS SMTP mail on another box as the SMTP address in the basic configuration of Listserv. When sending commands to the listserv via email it returns an email with no problem. However, when I have our program send an email to listserv to distribute the information, the listserv sends the mail out but it gets stuck at the Exchange server. Exchange responds with an error that a mailer is trying to send mail out. Any help is greatly appreciated. Thanks Mark Adrion ASI Consultant