I don't use confirmation links in email.
I have the system-generated emails sent to a moderator, who then PMs the new user with a "Welcome to the forum!" message. 99 times out of 100, the new user replies to this with a "Thank you".
Since vBulletin also emails the new user with a "Welcome" email, I check for bounced emails before upgrading new users. Bounced email = invalid email address = most likely spammer or bot.
I do have a User Promotion set so that a new user comes out of moderation after 25 posts or after 7 days. Theoretically this should give us plenty of time to catch spammers and bots before they come out of moderation. Luckily I've only had one, and we caught them within their first two moderated posts. :up:
-J
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