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Ok... I'm trying to understand how this works. I had a problem where the originating IP address inside my mail headers was incorrect (i.e. not the address of my mail server, but rather that of my router). The headers looked like this: Received: from postman5.mx.aol.com (postman5.mx.aol.com [205.188.157.132]) by mailops.mail.aol.com (8.9.3/8.9.3) with ESMTP id PAA05121 for <angarita@mailops.mail.aol.com>; 2002年3月26日 15:31:28 -0500 (EST) Received: from 12.34.567.89 (host-12-34-567-89.choiceone.net [12.34.567.89]) by postman5.mx.aol.com (8.11.1/8.11.1) with ESMTP id g2QKV7x16508 for <angarita@aol.net>; 2002年3月26日 15:31:07 -0500 (EST) Received: from microphotonics.com (host-12-34-567-89.choiceone.net [12.34.567.89]) (authenticated) by 64.65.217.10 (8.11.6/8.11.6) with ESMTP id g2QKUXv17133 for <angarita@aol.net>; 2002年3月26日 15:30:34 -0500 I managed to get them to look like this by changing an entry in my /etc/hosts file (I had forgotten to change it when I switched things around): Received: from mail.microphotonics.com (host-12-34-567-89.choiceone.net [12.34.567.89]) by rain.CC.Lehigh.EDU (8.12.2/8.12.2) with ESMTP id g2QKgAxs019997 for <dmh2@lehigh.edu>; 2002年3月26日 15:42:10 -0500 Received: from microphotonics.com (host-12-34-567-89.choiceone.net [12.34.567.89]) (authenticated) by mail.microphotonics.com (8.11.6/8.11.6) with ESMTP id g2QKfHT17309 for <dmh2@lehigh.edu>; 2002年3月26日 15:41:17 -0500 Message-ID: <3CA0DCFD.47824AA0@microphotonics.com> However, the originating IP address was still wrong. After trying the MASQUERADE_AS, with masquerade_envelope to no avail, I finally went into my router and started playing around with stuff there. I had been using NAT to get the router to connect the server's public IP address with it's private one. It's a Netopia router and the way to do this is to specify the port you're allowing (so 25 for smtp, 143 and 993 for imap, etc.) and then provide a public/private IP pairing. I nixed this, and looked up how to do static address mapping. Once I had this setup, I finally got the headers that I wanted. Received: from mail.microphotonics.com (mail.microphotonics.com [789.456.123.123]) by rain.CC.Lehigh.EDU (8.12.2/8.12.2) with ESMTP id g2RKDvxs002913 for <dmh2@lehigh.edu>; 2002年3月27日 15:13:57 -0500 Received: from microphotonics.com (host-12-34-567-89.choiceone.net [12.34.567.89]) (authenticated) by mail.microphotonics.com (8.11.6/8.11.6) with ESMTP id g2RKD4v22213 for <dmh2@lehigh.edu>; 2002年3月27日 15:13:04 -0500 My question is this... why did the static address mapping all of a sudden make this work. How does the sendmail program find out what IP it is sending a message from, and why didn't it find the correct one in the first place? -dave ______________________________________________________________________ Philadelphia Linux Users Group - http://www.phillylinux.org Announcements-http://lists.phillylinux.org/mail/listinfo/plug-announce General Discussion - http://lists.phillylinux.org/mail/listinfo/plug