[Rich]

In the older versions this was a large issue. However, now the modification uses the vbmail function which allows you to define how many emails it can send at once. If it needs to send more then that number then it stores them in the database and periodically processes as vbulletin normally does.

But if you process "x" amount of emails per hour, and the amount generated exceeds that number, you would still get a backup. It would all be qued to be delivered, but the mail que could be potentially backed up by days.

I am not just thinking of the mail generated by this script. i am trying to encompass all of the mail that the site already sends. With this added load, on active sites, couldn't this become an issue?

I think this is great for less active communities, but fear it would slow delivery to even normal email confirmations if the site is extremely active.