XF 1.1 Auto send emails to users that have been registered for so long?

#1
I'm wondering if it's possible to automatically send users emails or private forum messages when they've been registered on the forums for 1 week, 1 month and 3 months?

I'm running a Minecraft server and would like Xenforo to send users a password that they can use in-game to promote themselves, but only after they've been registered for certain periods of time.

Thanks
 
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