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.
Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.
Gmvault - Backup the emails in your Gmail account.
ZeroSpam - Cloud email security & anti-spam solution