When comparing Mutt vs Geary, the Slant community recommends Mutt for most people. In the question“What are the best native e-mail clients for Linux?” Mutt is ranked 2nd while Geary is ranked 4th.
Ranked in these QuestionsQuestion Ranking
Pro Terminal based
Pro Small and efficient
Pro Threads emails
Pro Active development
Even though it was first released in 1995, Mutt still enjoys an active community following it and having new releases constantly.
Pro Highly Configurable Macros
Pro Straightforward and simple UI
Setting up accounts is a simple as putting in the users e-mail address and password.
Pro Fast and responsive
Geary is faster than most e-mail applications, upon starting the program or even just browsing in folders.
Pro Beautiful UI
Everything about the look and feel of Geary is a breath of fresh air after the clunkiness and ugliness of it's competitors.
Pro Threaded conversations
Threaded conversations means all subsequent replies are view-able underneath the initial e-mail.
Pro Native GNOME application
It looks and works like a GNOME application should, so it Just Works™.
It runs inside the terminal so it doesn't display HTML email, fonts, or graphical elements.
Con No horizontal layout
There is no optional horizontal layout for those that want to be able to view their emails headers across the full screen.
Con No images in HTML signatures
Whilst it is possible now to add a HTML or plain text signature per account, there is no support for per images in the signatures. This is a must for when an employer imposes a set signature with images.
Con No PGP
No encryption available.
Con No Pop3 support
Con No native Exchange support
Whilst possible if your Exchange server and account are using Davmail as a proxy, at the moment you can't natively add an Exchange account.
Con Not seen as a secure app by Gmail
Con Made for Gnome 3
It may look out of place in any other desktop environment.
Con Development is pretty dead
No real development since March 2017.
Con No incoming message rules
Con No proxy support
Seems like it can't retrieve email from behind proxy.