I got the following challenge. I have a site that is hosted on a windows 2010 server and i am trying to get the website to send emails. The site runs on Apache 2.2.9, PHP 5.2.6 and we set it up to run on port 6000. I have setup the fakemail/sendmail script to send emails and it does so whithout any problems solong as the email adress that i am sending it from is not hosted on the actual box, but rather through a shared hosting provider.
So for example: The system will send mail if the email's from address is 'firstname.lastname@example.org' but refuses to send emails where the normal company email is handedled by exchange server eg 'email@example.com'.