MailCleaner VS Roaring Penguin Canit

SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.

SpamHero - SpamHero is a professional spam filtering accuracy while lowering the cost to domain and business owners.

Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.

SpamExperts - SpamExperts applies its proprietary smart technologies to eliminate spam, virus and malware mail before it reaches your network.

ZeroSpam - Cloud email security & anti-spam solution

Kundenserver - Kundenserver is an RBL-style host verification service to secure servers from spam emails.