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Mozilla Thunderbird for Android Is Finally Here
(www.howtogeek.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Why? What does FairMail do better? The headline says it's privacy oriented, but so is k-9.
I'd say customizability. Haven't used k-9 since I found FairEmail so can't really say anything about how it is now but it used to be pretty bare bones. At least compared to FairEmail.
I love FairEmail's simplified mail viewer that doesn't render HTML mails completely and they look more like an enhanced plain text mail instead.