Ranked in these QuestionsQuestion Ranking
Pro Open source
Pro Multiple account support
Multiple identities per account, notifications per account or contact.
Pro Actively maintained
It is actively maintained. The used libraries are up to date and bugs are fixed quickly.
There are no trackers within the app and trackers sent with mails are disabled by default. This app lets you read and compose emails with your privacy in your very own hands.
Pro Fast and customizable
Privacy features are excellent.
~ 20 MB.
Pro Identities support
Pro Two way synchronization
Pro Flat conversation threading
Pro Encryption support
Supports both OpenPGP and S/MIME encryption for total privacy.
Pro Support for safety and low-bandwidth
Allows to configure maximum size of email downloaded immediately.
Pro Can show plain text of html mails
Pro Show links before opening
Some HTML mails may show different links and link texts, this app however will show you the real link before opening, protecting against phishing and scams
Pro Recognize spoofing internationalized domain names
Some domain names may use non-ASCII characters looking similar to the latin alphabet (e.g. some cyrillic characters). This app will show you the punycode representation of the domain, if that is the case and thus protect you against phishing and scams.
Pro Reformat the HTML mail for increased privacy
Some HTML mails may include ressources that can track you. This app doesn't load them by default, but reformats the text, increasing both privacy and readability.
Pro Autoconfiguration with open standards
There are open standards for any email provider to show how an email client should connect to the server. This app supports both RFC 6186 as well as Thunderbird Autoconfiguration standards.
Pro OAuth support for most common mail providers
Supports authenticating with the mail server using OAuth, thus increasing security.