Thanks, Geoff.
I think SMF does have that setting to validate emails, so I'll investigate it further. I just eased my workload somewhat by configuring it so new members need to be approved before they can create a profile, etc. I had hoped to avoid that, but now I can check the requests to join, check the IPs at various spam agencies, and determine if the IP is associated with spamming. That's cut some of the time down. But if it gets any worse, I'll give you a yell. These spammers are remarkably persistent.
Best,
Dave