Thunderbird alternatives and similar tools

Based on the "Mail Clients" category.

N1

9.2 0.0 L2 Thunderbird VS N1

:love_letter: An extensible desktop mail app built on the modern web. Forks welcome!
ImapSync

6.7 2.6 L2 Thunderbird VS ImapSync

Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is

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Sylpheed

2.4 0.0 L2 Thunderbird VS Sylpheed

A mirror of the official sylpheed svn repository located at svn://sylpheed.sraoss.jp/sylpheed. The mirror does not include the branches.
Claws Mail

1.7 0.0 L2 Thunderbird VS Claws Mail

DISCONTINUED. Old school email client (and news reader), based on GTK+.
Mutt

- Thunderbird VS Mutt

Small but very powerful text-based mail client.
Nylas Mail

- Thunderbird VS Nylas Mail

Extensible mail client.