Set php mail() function to use smtp authentication

Question

So, how can I set php's mail() function to use smtp authentication?

I have a web server and then an mail server. All company's email, incoming or outgoing, passes through the mail server and I was wondering how to set the web server to use mail() function with SMTP authentication at the mail server.

Note: I need to do this globally, not to go file by file that runs the mail function in each site and start editing.

Answer 1

PHP's built-in mail() function does not expose functionality to make SMTP auth possible.

You would need to re-write existing code to use something like the PEAR Mail package.

Otherwise you may find it easier to set up a router on your web server's SMTP daemon to forward all outgoing mail to the mail server. In Exim, for example, this is accomplished with a smart_route definition.