Thread:Project:Support desk/MediaWiki not sending email/reply (2)

Uh... I just noticed that you're using PHP 5.4.11, which was released on 24-jan-2013, so you upgraded PHP to a new version recently, which probably caused the issue.

Since MediaWiki 1.11 wasn't tested with that version of PHP (which didn't exist at the time it was released), it may be some compatibility issue with mail functions.

Having upgraded PHP, I'd recommend upgrading MediaWiki as well.