New: Don't Sleep (Jul 11, 2022), Platform 22.0.1 (Jul 21, 2022)
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Mailpile is a cross-platform beta FOSS Mailpile Client. It runs its own webserver and has an interface similar to Gmail or Yandex.Mail. It supports pop3, imap and smtp and has strong integrating with gpg.
Dual-license: agpl and apache