Thank you for pointing this issue out — the file is not mentioned in the Manual just because of a human mistake :)
I'll add it a bit later.
This file includes just one function which is
sendMail, and optionally includes libraries from
PHPMailer.
The function could be overwritten in
bb_plugins.php; default is used to send emails from miniBB forum. This includes registration emails, new post notifications to members and admin, and so on.
You're safe to use this file, if you have enabled email notifications in
setup_options.php — i.e. having
$genEmailDisable=0;
If it's set like
$genEmailDisable=1;
all emailing from the forum is disabled, and then you don't need this file — it can be deleted if in doubt of its usage.
