php mail not arrives at gmail, not at local server

Posted by thomas on Server Fault See other posts from Server Fault or by thomas
Published on 2012-09-17T15:30:13Z Indexed on 2012/09/17 15:40 UTC
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The php mail function I am using does not work completely. It will sent mails to gmail easy enough. However, emails routed directly to my internally hosted exchange server are not getting through.

The servers/domains are setup is as follows.

URLs are registered with Network solutions (www.independentsservice.com & www.isco.net)

NS directs all traffic to our ISP (Socket.net). Socket directs as follows:

Mail to our local server FTP to our local server HTTP to our website hosted on Chihost.com

Traffic to our local server goes through a Watchguard firewall which routes mail traffic to our locally hosted Exchange server.

Is there some reason why exchange won't accept these emails?

Thanks!

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