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JAVesey,
Why not just censor his domain name, then at least it wont be posted on XOOPS. Mamba knows how to set that up in no time.
Also what type of E-mail address is he using, could the domain ext be banned? or is it something like GMail?
Perhaps also trace his IP and report him to his ISP. (They may remove him as a customer)
Do a WHOIS on that domain name, and report it to his hosting providers and/or domain providers. (They may remove him as a customer)
They are responsible to offer assistance when it's spammers.
Perhaps this would make him stop.