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LineageOS is currently installed on 1.5 million Android devices
(9to5google.com)
Lineage OS
lineageos.org | Wiki
IRC | Unofficial Matrix room | Discord
Other LineageOS communities on Lemmy
Emails for well and any good messaging service worth using shouldn't need a special android. In fact, I would go as far to say that it should be completely libre and on F-droid.
I really don't like discord so I can't really relate