i recommend banning their username instead of deleting and allow posting for only Registered users group and above, not for users awaiting email confirmation.
Now, whenever you ban a username, their email gets banned too. So, they'll have to register again with a new username and email and confirm it as well.
If still they take too much pains to register and confirm, simply ban their IP range.
This would help you reduce spamming to a great extent !!
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