When comparing Mutt vs Sylpheed, the Slant community recommends Mutt for most people. In the question“What are the best native e-mail clients for Linux?” Mutt is ranked 3rd while Sylpheed is ranked 16th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Terminal based
Pro Small and efficient
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 It runs inside the terminal
It doesn't display HTML email, fonts, or graphical elements.
Pro Compose mails in your favorite editor
Edit mails efficiently with an editor you already can work fluently with.
Pro Highly configurable macros
Pro Threads emails
Pro Work with regular expressions
Mails can be filtered, deleted, flagged, etc. with regular expressions which makes mail management very efficient.
Pro Reliable
No issues with stability or stuff going missing.
Pro Comprehensive settings
Pro Very very lightweight
It is simple and very lightweight where claws mail added a lot of bloat like themes and plugins slypheed keeps it simple.
Cons
Con Terminal-based
It runs inside the terminal so it doesn't display HTML email, fonts, or graphical elements.
Con No encrypted mailbox
Likely hasn't been done by anyone since Calypso/Courier back in the 00's.
