Thread/Forum subscription emails stopped, how to fix?

[freeones_raymon]

Last week our mailserver crashed which resulted in the fact that all sent email were not sent at all. And because the board system only sends out one subscription email until you visit the thread/forum, a lot of subscriptions emails stopped.

I would like to update the database so that all subscription emails will be send again, regardless of their status. When I look into the database I see the tables "subscribeforum" and "subscribethread", which both have a column named "emailupdate". I found out that this means "no", "instant", "daily" or "weekly" updates, but I cannot find any tables that contains information about users already notified and not visited the thread.

Can anyone tell me what to do?!

Thanks in advance,
Raymond