MailStore - MailStore Home - A 100% free single-private-user desktop solution
Barracuda Email Security Gateway - Barracuda's Email Security Gateway is a powerful antivirus filter specifically designed to identify and eliminate email-borne threats, stopping hazards before they reach the network.
imapsync - Console-based utility for migrating IMAP mailboxes.
Symantec Email Security.cloud - Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats
MozBackup - Backup tool for Firefox and Thunderbird
Cisco Email Security - Cisco Email Security protects against ransomware, business email compromise, spoofing, and phishing.