Here's the answer
It's a vBulletin mod that sends out an E-mail to a member when he hasn't been active in XX days, like 30, then sends another one out in XX days. There's two versions in there, depending on how powerful the server is.
1.09.zip - If the server can't handle thousands of E-Mails going out at once, like on the first day you use it, and then 30 days later when all the inactives are due for another E-Mail. Instead you can have it send up to 25 E-mails at a time, I think per hour.
1.11.zip - If you got a Google like server and can handle tons of E-mails going out at the same time, this is the one to use.
I first used 1.11, and it was downtime for about an hour while the mod was doing it's job. I quickly downgraded!!!
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