With SFS turned on within UBB.threads 7.6.0; SFS is done once at every new user creation, and once at every login -- every time.
If any spammer already has an account (from before SFS was turned on), they wont be able to log in with an ip/email address if its on the current SFS list.
--
unless your idea was just an attempt to search for legacy members who created accounts a long time ago, by validating those "registration IP addresses" to a current SFS IP address database. then deleting those accounts. Your legacy members might not even be tied to those old IP addresses any more, but you would punish them (deleting their accounts) for an address match to an IP/email they no longer have.
