Hi -- I've recently upgraded my DEC Alpha to Berkeley Sendmail 8.8.6 and now (with the arrival of students) I'm suddenly receiving lots of messages like this. Is there something I should look at in my ListServ setup or are these errors coming from one of my users who has misconfigured their E-mail settings? (See sample below) Any advice would be most appreciated!! Debby Quayle -------------------------*--------------------------- Debbora (Debby) Bartel Quayle Asst. Dir.ITS, Technical Support Services/ Help Desk & E-mail Administration Information Technology Services Department Hamilton College (315) 859-4031 [log in to unmask] -------------------------*--------------------------- ----- The following addresses had permanent fatal errors ----- <[log in to unmask]> ----- Transcript of session follows ----- 554 rewrite: map @ not found ... while talking to microsoft.ease.lsoft.com.: >>> MAIL From:<@@hamilton.edu> <<< 501 Syntax error in return path 501 <[log in to unmask]>... Data format error PS:I checked my Sendmail ruleset and it only contains one @ character. I don't know where else to look.