I have been receiving messages as quoted below when sending mail through the server. Sometimes they are just text messages to one domain, sometimes when I send a group mail they are for all domains. It seems to make no difference whether there is an attachment or not. It also seems sporadic - I can send 3 or 4 messages with no problems then the next several bounce. here is a sample: From: Mailer-Daemon@server.servername.com Subject: Mail delivery failed: returning message to sender Date: June 7, 2005 5:32:39 AM CDT To: email@example.com Return-Path: <> Envelope-To: firstname.lastname@example.org Delivery-Date: Tue, 07 Jun 2005 06:32:40 -0400 Received: from techie3 by server.servername.com with local-bsmtp (Exim 4.50) id 1DfbNv-0001ZB-Ln for email@example.com; Tue, 07 Jun 2005 06:32:40 -0400 Received: from mailnull by server.servername.com with local (Exim 4.50) id 1DfbNv-0001Z7-Jd for firstname.lastname@example.org; Tue, 07 Jun 2005 06:32:39 -0400 X-Failed-Recipients: email@example.com Auto-Submitted: auto-generated Message-Id: <E1DfbNv-0001Z7-Jd@server.servername.com> X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on server.servername.com X-Spam-Level: X-Spam-Status: No, score=-1.2 required=5.0 tests=ALL_TRUSTED,AWL,UNIQUE_WORDS, UPPERCASE_25_50 autolearn=ham version=3.0.3 This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: firstname.lastname@example.org unrouteable mail domain "direcway.com" ------ This is a copy of the message, including all the headers. ------ Return-path: <email@example.com> Received: from dpc6744130013.direcpc.com ([220.127.116.11] helo=[192.168.123.174]) by server.servername.com with esmtpa (Exim 4.50) id 1DfbNq-0001YH-0I for firstname.lastname@example.org; Tue, 07 Jun 2005 06:32:39 -0400 Mime-Version: 1.0 (Apple Message framework v730) To: email@example.com Message-Id: <2CB3EFBC-1333-410D-98E7-8445DFCF60B4@domain.net> Content-Type: multipart/mixed; boundary=Apple-Mail-2-246708033 From: "R. J. Mike Nielsen" <firstname.lastname@example.org> Subject: Proof Date: Tue, 7 Jun 2005 05:32:25 -0500 X-Mailer: Apple Mail (2.730) X-PopBeforeSMTPSenders: email@example.com,firstname.lastname@example.org,email@example.com,firstname.lastname@example.org,email@example.com My setup: cpanel 10.2x CURRENT default catch all = fail inlude list of pop before smtp senders... ON Silently Discard all FormMail-clone requests with a bcc: header in the subject line... ON track origin of messages sent through mail servrer... OFF prevent user nobody... OFF max emails domain can send per hour.....100 EXIM config: Always set the Sender: OFF verify the existance of email senders ON discard emails..... ON Ran /scripts/exim4 --force (v4.5x) /scripts/fixcommonproblems Any suggestions?