Isles Tech

By default MyBB won't subscribe posters to threads unless the member has chosen such option in his UserCP. Here's how to make that a default option:

In member.php, change

if(!$fromreg)
{
$allownoticescheck = "checked=\"checked\"";
$hideemailcheck = '';
$emailnotifycheck = '';

to

if(!$fromreg)
{
$allownoticescheck = "checked=\"checked\"";
$hideemailcheck = '';
$emailnotifycheck = 'checked="checked"';

This change will only affect new users. You can instruct current members to enable notifications on their own via UserCP > Edit Options > check 'Automatically subscribe to threads you post in.' Or you can do it via SQL: UPDATE mybb_users SET emailnotify='yes' (replace mybb_ with your table prefix).

(Please take note that only a few members would really like this functionality, and it will annoy more than it would help many.)