My forum is flooded with spam

[paul29]

As an example: Re: Spammers and spamming...

I am using that verification questions method and for a while I wasn't getting any spam. But now I just checked and my forum is flooded with spam! What happened? How do I stop it? Also it seems all of the spam is coming from russia using a hxxp:mail.ru [nonactive] email. How do I block someone from registering using a hxxp:mail.ru [nonactive] email account?

[Shambles]

...  I just checked and my forum is flooded with spam!

This is someone else's support topic, but in answer to your question, have a read here:

Spam - my forum is flooded with spam, what can I do

[Black Tiger]

I am using that verification questions method and for a while I wasn't getting any spam. But now I just checked and my forum is flooded with spam! What happened? How do I stop it?

Start at least with changing your questions every 3-6 months.
There is also a mod with which you can ban emaildomains like @domain.ru but that can't block subdomain wildcards.
They might not like me saying this because it's not intended for this use but I'm using the banning system to block *@*.ru domains (and kindlike), which also blocks all kind of subdomain emails for example.

However, mostly several good Q&A combined with stopforumspam should be good enough.