existing users:

If you want to make reply notification the default for existing users, run the following SQL query:
CODE: SELECT ALL

UPDATE phpbb_users
SET user_notify = 1
WHERE user_type <> 2;
new users:
'user_avatar_width' => 0,
'user_avatar_height' => 0,
'user_new_privmsg' => 0,
'user_unread_privmsg' => 0,
'user_last_privmsg' => 0,
'user_message_rules' => 0,
'user_full_folder' => PRIVMSGS_NO_BOX,
'user_emailtime' => 0,

 'user_notify' => 1,
'user_notify_pm' => 1,
'user_notify_type' => NOTIFY_EMAIL,
'user_allow_pm' => 1,
'user_allow_viewonline' => 1,
'user_allow_viewemail' => 1,
'user_allow_massemail' => 1,
admin