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



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Regards,
Randy Klumph
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Western Oregon University
Teaching Research Division
345 N Monmouth Ave
Monmouth, OR 97361

http://www.tr.wou.edu