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A comment on Email Client for the Terminal?.
(Other software has bugs. Mutt has fleas.)
See also: Neomutt.
Alpine. Probably fits your requirement for "simpler", though mutt, as with vim, strongly rewards familiarity.
Gnus or mu4e, under Emacs.
Old school: Elm, pine.
See: <https://en.wikipedia.org/wiki/Text-based_email_client>.
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(Other software has bugs. Mutt has fleas.)
See also: Neomutt.
Alpine. Probably fits your requirement for "simpler", though mutt, as with vim, strongly rewards familiarity.
Gnus or mu4e, under Emacs.
Old school: Elm, pine.
See: <https://en.wikipedia.org/wiki/Text-based_email_client>.