Sometimes... BUT not all the time... my mail gets sent with the domain of @localhost.localdomain where do I fix this problem! I have looked at sendmail.cf and cannot readily find the rule which governs this kind of problem... a lot of rules are close but none fit exactly. What are the networking files I should look in? Thanks for your help! Lynn HERE IS AN EXAMPLE...... Message 20: >From MAILER-DAEMON@sol.createv.com Thu May 31 09:47:16 2001 Date: Thu, 31 May 2001 09:45:55 -0700 From: Mail Delivery Subsystem To: lynn@localhost.localdomain MIME-Version: 1.0 Content-Type: multipart/report; report-type=delivery-status; boundary="JAA16032.991327555/localhost.localdomain" Subject: Returned mail: Data format error Auto-Submitted: auto-generated (failure) This is a MIME-encapsulated message --JAA16032.991327555/localhost.localdomain The original message was received at Thu, 31 May 2001 09:45:54 -0700 from lynn@localhost ----- The following addresses had permanent fatal errors ----- jmiller16@home.com ----- Transcript of session follows ----- ... while talking to mx-rr.home.com.: >>> MAIL From: SIZE=1289 <<< 501 5.1.8 ... Domain of sender address lynn@loca lhost.localdomain does not exist 501 jmiller16@home.com... Data format error --JAA16032.991327555/localhost.localdomain Content-Type: message/delivery-status Reporting-MTA: dns; localhost.localdomain Arrival-Date: Thu, 31 May 2001 09:45:54 -0700 Final-Recipient: RFC822; jmiller16@home.com Action: failed Status: 5.5.2 Remote-MTA: DNS; mx-rr.home.com Diagnostic-Code: SMTP; 501 5.1.8 ... Domain of sende r address lynn@localhost.localdomain does not exist Last-Attempt-Date: Thu, 31 May 2001 09:45:55 -0700 --JAA16032.991327555/localhost.localdomain Content-Type: message/rfc822 Return-Path: Received: (from lynn@localhost) by localhost.localdomain (8.9.3/8.9.3) id JAA16030 for jmiller16@home.com; Thu, 31 May 2001 09:45:54 -0700 Date: Thu, 31 May 2001 09:45:54 -0700 From: lynn tilby Message-Id: <200105311645.JAA16030@localhost.localdomain> To: jmiller16@home.com Subject: 675 Config Q's