php mail() and firewalls

I've created an email form that emails from my client's web site to my client using the php mail() function. The web server and mail server are on seperate machines. It works on all email addresses I've tested (it's a script that I've used many times before) except my client's email address. The only difference is that my client's mail server is behind a firewall. I can only assume that this is the problem, but I'm not sure of what to do about it.

Is there something that can be done in my mail script to allow it to pass through a firewall (I can't imagine there is, but I thought I'd ask) or is it something that needs to be taken care of by the mail server admin

Or, could it be something else entirely

Posted On: Wednesday 24th of October 2012 12:32:52 AM Total Views:  440
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