I've got a strange issue with my forum's daily digest emails which is causing them to occasionally be sent to everyone multiple times. This only happens once every few months, and all users get the same number of copies. The last time it happened, everyone got five emails. There are no clues in the logs, and the fact that it happens so rarely means it is very difficult to trace. I have read that there was an issue similar to this which was fixed in v2.2.0, but I'm running v2.2.3 on DNN 9.

Of course it's possible that this is a problem with the SMTP server and not YAF at all, but I thought I should check whether anyone is aware of this problem or a fix for it?

It's actually a bug!

And will be fixed with the next update 02.30.04