Update phpMailer to version 5.2

[westi]

PHPMailer development is now in Apache Extras and the current version is 5.2

We should update this and then push any changes we want to recommend upstream

Improvements in 5.2:

• Adds support for more MIME content types

[westi]

PHP 5.2 for WordPress

[westi]

With the update to PHPMailer 5.2 we no longer need any hacks in the Unit Tests to make the code testable so I removed them for WP 3.4 and later in ​[UT492]

[westi]

In [19632]:

Update PHPMailer to version 5.2. See #19677

[westi]

Leaving the ticket open in case these changes bring any issues - not expected as they passed all our unit-tests :)

[barry]

​http://core.trac.wordpress.org/browser/trunk/wp-includes/class-phpmailer.php?rev=19632#L760

Looks broken. The - should probably not have been changed to a .

Not sure how the unit-tests passed :)

[westi]

Replying to barry:

​http://core.trac.wordpress.org/browser/trunk/wp-includes/class-phpmailer.php?rev=19632#L760

Looks broken. The - should probably not have been changed to a .

Not sure how the unit-tests passed :)

Good Catch.

Core WordPress always uses mail() sending not smtp which is why the tests didn't catch this.

[MattyRob]

Here's a quick patch for the class-smtp.php file name difference. This is how it was implemented in previous versions.

[ryan]

In [19642]:

Include class-smtp.php not class.smtp.php. fixes #19677