What are All the Ways a Programmer Could use PHP to Send an Email?

Posted by Alan Storm on Stack Overflow See other posts from Stack Overflow or by Alan Storm
Published on 2010-05-27T00:35:46Z Indexed on 2010/05/27 0:41 UTC
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I'm looking for a list of built in PHP functions that a programmer could use to send an email.

The obvious answer here is mail(), but I'm also looking for a list of functions someone might use to manually open a connection to an MTA, or spawn a process on the local machine which might in turn send an email using sendmail, postfix, etc.

The context here is I want to scan a large, unknown codebase for code that's sending out email (because we already located a call to mail(), and that's not doing it)

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