Any mail function within MediaWiki (mail a new password, email user, confirm
email, ENotif) is potentially(*) broken in a certain php version [1] due to a
missing space. This has been reported by a user.

Fix by adding an additional space after the "-f" option letter.

Example 3 in [2], which was used when implementing this in UserMailer.php, does
not show the space, but it helped to get a touchy php mail() implementation running.

Therefore I suggest to change line 132 in UserMailer.php from
mail( wfQuotedPrintable_name_and_emailaddr($to), $subject, $body, $headers,
"-f{$wgEmergencyContact}\n");
to
mail( wfQuotedPrintable_name_and_emailaddr($to), $subject, $body, $headers, "-f
{$wgEmergencyContact}\n");

[1] PHP: 4.3.10 (apache)
[2] http://www.php.net/manual/en/function.mail.php

Version: 1.5.x
Severity: critical
URL: http://www.php.net/manual/en/function.mail.php