Well, they'll only be "locked out" if they show in the Stop Forum Spam database; and to be IN that database, they'd have to be reported as a spammer by several sites...
And IF they're banned BECAUSE they're in the DB, there is an obvious message posted to the screen as well as instructions on how to get themselves delisted...
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.