Peter said:

I have now hacked the code so that there is now a list of usernames and e-mail addresses that guest users cannot use. (There's only one item on each list right now...)

You're a hacker now? Sheesh, can you hack into my bank account and deposit a few thousand? lol

I'd like to avoid going the "block entire countries" route. We don't want to stop prospective Canadian visitors from getting the full story on the situation with Canadian cell phone plans! Plus, if someone really wants to spam you and they're doing it manually (there are certainly tricks we can use against spambots), they have all sorts of tools like anonymous proxies and virtual private networks to appear as though they're coming from many different places.

bylo said:

Good! One problem you may encounter is that these spammers may use different IPs every time just as e-mail spammers use different e-mail addresses. I suppose one way to deal with that would be to block entire IP address ranges, and perhaps even entire countries, from being able to post here. After all, how many people located in, for example, China or Russia would have a legitimate reason for posting on a forum devoted to a Canadian MVNO?

MVNO??