One of my users accounts is generating the following error > Last error: SMTP; 553 sorry, your envelope sender has been denied (#5.7.1) I had him send it to his ISP but they do not understand the error message and will be contacting me for clarification. Can someone help me understand the problem so that I can inform the ISP and resolve the issue. Thanks ------------ Regards, Randy Klumph [log in to unmask] Western Oregon University Teaching Research Division 345 N Monmouth Ave Monmouth, OR 97361 http://www.tr.wou.edu