Setting up Postfix and Dovecot as a Satellite for Outlook

Hello all!

I'm trying to set up Postfix and Dovecot on my Linode. All my mail from all my domains is sent and received through Outlook, as suggested by the Linode documentation.

I can receive and send email fine, so Outlook is properly configured. The problem comes from PHP's mail() function. The scripts are properly coded, they run fine, but nothing is being delivered.

So far all guides I've found on Linode show you how to set up Postfix and Dovecot if you are using your Linode as the mail server, but can't find proper configs on using it as a satellite with Outlook.

Any pointers greatly appreciated!

Thanks. 8)