Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
HEY - Email at its best, new from Basecamp.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
MailMeter - MailMeter is a software that allows cloud or on-premise-based email management and compliance platforms, helping you to locate every single email in your organization, conduct eDiscovery, freedom of information, and DSAR’s searches from your emulato…