Mail() Problems in a heterogenous network

Ok. Here's the situation: I'm running PHP on a Unix (SGI) box with Apache as a module running an Intranet web server (call it inside.mydomain.com). Sendmail is running on the machine. I'm on a network with a windows Mail server (MS. Exchange 5.5) with (I'm told) appropriate SMTP services running (call it mail.mydomain.com). I'm using a mail class I downloaded from somewhere, which basically calls PHP's mail funciton. The behaviour is this: When I send mail from the webserver (running as nobody@inside.mydomain.com) to an inside address (same domain, i.e. jparker@mydomain.com) I get everything just fine. I can even use the from feature in the mail class to make the mail appear to come from a real (or not so real, I've tried god@heaven.org and it takes it just fine) address. However, when I send mail to an outside address, i.e. somebody@yahoo.com, it gets dropped somewhere. Unfortunately those running the mailserver are unable/unwilling to help me track this down, so I've got to come to you guys with limited information and hope you have an answer. If it helps, here's the header of a message sent from inside.mydomain.com to an inside address. Thanks in advance. Received: from sneasv02.omniquip.textron.com (insidesnorkel.omniquip.textron.com [10.220.15.149]) by oqamapw1ab.omniquip.textron.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2650.21) id 14MPSVVH; Sat, 24 Feb 2001 11:18:24 -0600 Received: (from nobody@localhost) by sneasv02.omniquip.textron.com (980427.SGI.8.8.8/970903.SGI.AUTOCF) id LAA42386; Sat, 24 Feb 2001 11:13:51 -0600 (CST) Date: Sat, 24 Feb 2001 11:13:51 -0600 (CST) Message-Id: <200102241713.LAA42386@sneasv02.omniquip.textron.com> To: jparker@omniquip.textron.com Subject: You\'ve been very good From: god@heaven.org MIME-Version: 1.0 Content-Type: multipart/mixed; boundary = b0c7d5a8cfe35ac094237730d7b4e46d6 ... ... .. John Parker ---------------------------------------------------------------------------- ------------------------------- John Parker, Senior Design Engineer Ph: 816/676-6419 Fax: 785/989-3556