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This thread explains the problem pretty well: http://www.irbs.net/internet/postfix/0309/2932.html " ..the problem is that Yahoo is sending 8bitmime formatted email (as Exchange announces 8bitmime support) but when Exchange forwards that email on (in our case to a postfix server) it doesn't notice that the remote server will accept 8bitmime formatted and so refuses to deliver it.." *surprise* .. Exchange is the system causing the problem in this case. Hope this helps. -Russell > -----Original Message----- > From: MSU Network Administrators Group > [mailto:[log in to unmask]] On Behalf Of Steve Plemmons > Sent: Thursday, March 09, 2006 1:09 PM > To: [log in to unmask] > Subject: [MSUNAG] Problem forwarding to MSU Mail > > We have an exchange server in Statistics. One user forwards > all his e-mail > from the stt.msu.edu domain to his msu.edu account. This > works fine except > when an e-mail is sent from a few select domains. The ones > that repeat > themselves consistently are yahoo.com and uiuc.edu. > > The mail bounces back to the sender with the following error message: > > Date: Tue, 7 Mar 2006 21:45:22 -0500 > From: [log in to unmask] > Subject: Delivery Status Notification (Failure) > To: [log in to unmask] > > Body: Open > Reporting-MTA: dns;sttweb.sttwin.stt.msu.edu > Arrival-Date: Tue, 7 Mar 2006 21:45:22 -0500 > > > Final-Recipient: rfc822;[log in to unmask]: failedStatus: > 5.6.1Diagnostic-Code: smtp;554 5.6.1 Body type not supported by Remote > HostX-Display-Name: Melfi MSU > Date: Tue, 7 Mar 2006 18:43:20 -0800 (PST) > From: Xuming He <[log in to unmask]> > Subject: RE: Michigan State University > To: Dennis Gilliland <[log in to unmask]> > Cc: Yimin Xiao <[log in to unmask]>, Vince Melfi <[log in to unmask]> > > Any ideas? > > Thanks, > > Steve Plemmons > [log in to unmask] >