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Add to SafariWhen comparing Mu4e vs Hiri, the Slant community recommends Mu4e for most people. In the question“What are the best native e-mail clients for Linux?” Mu4e is ranked 10th while Hiri is ranked 12th. The most important reason people chose Mu4e is:
The UI is designed to allow for quick keystrokes to get around and is pretty clean. Header View:  Message View: 
Specs
Question Ranking
Pros
Pro UI optimized for speed
The UI is designed to allow for quick keystrokes to get around and is pretty clean.
Header View:
http://www.djcbsoftware.nl/code/mu/mu4e-2.png
Message View:
Pro Asynchronous
Heavy actions never block emacs, unlike most other emacs email clients.
Pro Fully Search Based
Mu4e has no folders or other organizational tools, rather it relies on very fast search queries to help you find your mail.
Pro Can write rich text emails
Using the (beta) org mode, Mu4e can compose fully rich text emails.
Pro Built-in Autocomplete
Doesn't require you to import address books for autocomplete, learns from your emails just like Gmail.
Pro Simple and modern UI/UX design
Cons
Con Dead product
No release in well over a year, no support, and a permanent "never to be repeated" offer. This product is now looking like a con itself.
Con Not free
You have to subscribe to a paid plan to use it.
Con Cannot unsubscribe or cancel service
Cancellation requests go unanswered but the yearly invoices continue to arrive and credit card is charged.
Con No POP3 support
Con No IMAP support, only for Microsoft Exchange
