Our PhpBB forum slightly customized by us earlier used to send out topic reply notification email template successfully to those "watching the topic" after moderator approves to publish any message posted by a user in the forum. The customization by us was only in the part whereby moderator needs to now approve any post before it is published inside the forum, else features-wise is almost the same as other phpBB forums. Now strange thing : the topic reply notification email which used to go out to the persons "watching the topic" doesn't get delivered to them anymore when other users' replies have been approved by moderators to be published under the very same topics. Note: it is selected already by default when a user attempts to post a new reply under a topic, so it is strange that it is not working. Now, please troubleshoot to 'HIT THE NAIL IN THE HEAD' to enable topic reply notification email template to get sent out to the corresponding users. For some background info, this template started out as a publicly available and downloadable plug-in which was installed inside our forum before.