Hi All, I am trying to configure sendmail on a RH 6.1 box, and it will send mail out, but it keeps getting bounced: the error I get is: ----- The following addresses had permanent fatal errors ----- jackryan@azbiz.net ----- Transcript of session follows ----- ... while talking to warp.azbiz.net.: >>> MAIL From: SIZE=303 <<< 501 ... Sender domain must exist 501 jackryan@azbiz.net... Data format error I am thinking that is because the address is yaqui.we-web.com and not we-web.com. Is this a correct assumption? I looked in the bat book (Arrrgggh!) but I didn't see anyplace to change it. Help!? Pleeze!!! Thanks, Sean