Fionntulach, if you suspect that ForumUp somehow provide spammers with emails from the forums, and the forum owners, then I can assure you that this is not the case.

But there are numerous ways for spammers to get hold of email ads.

For example, keep in mind that an activation email is sent every time a spambot registers on your forum. Most of those activation emails end up in "empty space", as the spambots use "false" adresses. But a few will end up in the mailboxes of spamming companies, who make use of them. There is no good protection against that, I'm afraid.

To use the blocking list provided by Margaret will pobably get rid of some of them, but only if the spammer emails are blocked before the first activation email is sent from the forum. And the list is far from complete, for obvious reasons...

There are still the old fashioned "reading-email-adresses" bots around. They can at least be fought off, to a large extent, by the use of spampoison. I have used it to -- what seems like -- good effect on my forum, from the start:

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FoxLeonard