MailStore - MailStore Home - A 100% free single-private-user desktop solution
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
Mail Backup X - Your one stop mail backup and archiving tool for Mac.
MailCleaner - Cloud & on-premise anti spam software for businesses
MailSteward - MailSteward : The Ultimate E-mail Manager for Mac OS X
Vade Secure - Email security to protect against email-borne phishing, spear phishing, malware, and ransomware. Email security and management based on artificial intelligence.