<A target="_blank" href="http://chris.brandlehner.at/Brandlehner/cab_blog.nsf/d6plinks/CBRR-7NSD6R">Domino 8 offered an Internet Password Lockout</A> for HTTP and HTTPS protocols. Unfortunately, it doesn't work for SMTP. Christian Brandlehner offers some code to help secure SMTP against hacks.