There is no extension that causes users to be routinely subscribed to topics, but the nature of the forum means that many users will have subscribed.
No I cannot be sure how many notification emails are being sent.
In the past I always operated with email package size to 0 (zero) in ACP. Post response times have occasionally been as slow as 30 seconds, more typically 10 seconds. Setting the email package size to 10 caused an immediate improvement, with typical post response times around 2 seconds. Obviously post response times are subject to a host of variables, including the load on the server at the time (it is a shared server), number of users active on the forum, Internet performance etc. etc.
My question relates to how the email package size functionality actually operates, and can I be sure that setting the email package size to something other than 0 will still allow all notification emails to be sent, and in what time frame ? At this time I am not concerned about post response times which are OK. Maybe I should have reflected the question more accurately in the Subject line of this topic.
All the best