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FOSS email clients on Linux?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Thunderbird is and always has been the GOAT. The only real downside is the lack of a tray item, but this can be partially solved by installing Birdtray. I think Thunderbird 115 released with this feature, but it only works on Windows. Fingers crossed that it comes to Linux soon
What I don't like about Thunderbird is the mbox mail format (one file per folder). It's not a good fit for my use case — personal email where some folders can amass many thousands of messages — Thunderbird bogs down eventually.
I've been using Claws Mail, it's fast and customizable, with great filtering and scripting abilities and tray notification plugin included. Claws uses MH format which is one file per message. But it doesn't support maildir.
Evolution is another good client with the ability to use either mbox or maildir, but it stores the metadata in its own format.
mutt is the absolute best if you don't mind a console client.
I heard good things about Balsa but last time I tried it (years ago) it was still not mature.