Manual:$wgSMTP

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For using a direct (authenticated) SMTP server connection, you need to fill an array. Set to false (the default value) to use the built-in PHP mail() function.

For example:

$wgSMTP = array(
 'host'     => "mail.example.com", //could also be an IP address
 'IDHost'   => "example.com",
 'port'     => 25,
 'auth'     => true,
 'username' => "my_user_name",
 'password' => "my_password"
);

'IDHost' is a MediaWiki-specific setting used to build the Message-ID email header (see RFC 2822, sec 3.6.4 for more information on a properly formatted Message-ID). For the remaining settings, see Mail::factory() for a more complete description. (Scroll down to the smtp parameter.)

Warning: This setting requires PEAR's Mail package to be installed (run "pear install MAIL Net_SMTP").