mu4e is using mu [[https://github.com/djcb/mu/]]
inside of emacs. This is an example setup for multiple accounts using the 2017 mu4e-contexts feature.
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regular gmail
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hosted gmail
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regular outlook.com
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hosted office365
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Yandex.com (tricky tls setup)
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Mail.ru (tricky tls setup)
A complete working setup for mu4e is split among at least 3 config files, the emacs config, the getting new mail, and the sending mail. Here I get mail with the isync package, I prefer it to offlineIMAP.
sending is msmtprc
receiving is mbsyncrc
emacs is init.el or .spacemacs (user-config)
testing is /usr/local/bin/testemail
.