Has anyone had experience with PHP or a mail server setting the X-Return-Path header 
on mail sent using PHP's mail() command?  
Our tests indicate the X-Return-Path is being set to the "sendmail_from" address found 
in php.ini.  Our code definately isn't doing it, as a hello-world mail() example 

The system is running Win 2K, all current service packs and hot fixes, IIS 5, php 
4.2.3 (running as a CGI),  and the Zend optimizer 2.0.1.  The mail server is Microsoft 
Exhange Server.  

Does anyone know why the webserver or mail server would set the X-Return-Path, and if 
it can be suppressed?


Darren Fehrmann

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