Anti-Spam SMTP Proxy Server is described as 'The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning' and is a Anti-Spam tool in the network & admin category. There are more than 10 alternatives to Anti-Spam SMTP Proxy Server for a variety of platforms, including Linux, Self-Hosted, Web-based, Windows and SaaS apps. The best Anti-Spam SMTP Proxy Server alternative is Mailwasher, which is free. Other great apps like Anti-Spam SMTP Proxy Server are SpamAssassin, Proxmox Mail Gateway, BoxTrapper (cPanel Tool) and BitNinja Server Security.