Here's the
full-featured vbStopForumSpam mod listed for 3.8. It checks for the usernames, the email addresses and the IP addresses of known spammers, AND has a logfile, AND has a report-back feature in the AdminCP for tagging NEW spammers back to the StopForumSpam.com database so that OTHER boards don't get plagued.
https://vborg.vbsupport.ru/showthread.php?p=1880349