[Muellmann]

I waited such hack, I guessed that "live-checking" of mailaddresses is possible via sockets.

Works fine for me in my older 3.6, but some big providers like "yahoo.com" report for every fantasy mail the status valid mailaddress unfortunately.

But however this hack stops most bots and reduces fake mail registrations and so
I installed and also nominated it as motm.
It's a real alternative to the activation mails. 80% of my users remained inactive with mail confirmation switched on, because they weren't able to click the mail verfication link somehow. So this hack is a real alternative to this and how someone already mentioned it, it should be a default build in feature of vbulletin.
Thank you very much for this clever hack.