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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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I've been using Thunderbird almost 20 years. It's about to start having a makeover, so that could be interesting.
I am also using Thunderbird since many years. I used KMail for some time but run into problems too often.