Thread:Project:Support desk/Email Confirmation Failure/reply (3)

>MediaWiki 1.12.0 PHP 5.2.9 (apache2handler) MySQL 5.0.32-Debian_7etch6

That's a much more believable version (The other one you gave is the version of this wiki, which is unlikely to be what you're using). It's also a fairly outdated version of MediaWiki (you should consider upgrading perhaps, but that's beside the point),

>My OS is Windows 7 Home Premium.

I meant your webserver's os (based on the version string given above its linux). What sounds most likely is there's something wrong with your host. If you have ssh access, you can test if the mail command works properly. If you don't know how to do that, your best bet is probably to ask your host - tell them that php's mail function is returning false (that's what "mailer error" means, that the mail function returned false).