How to block spam users from registration.

Question

How do I block spam users registering  to site. I have a list of spam users in my users list

Answer 1

let it confirm by email

Answer 2

This is what i do:

1. No links unless answering questions.

2. Confirm email to answer.

3. 1 IP can register every hour

4. Users can't answer ther own questions

Not a single spammer in site (so far).

Comments

In addition, it could be useful not to allow profile info changes until email is confirmed (lurkers can register just to set links to their websites)

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how it can possible not changes info before email confermation?

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@asif - you'll find this information on the Admin > Spam page

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1. No links unless answering questions.
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How do you do this?