When comparing Sylpheed vs Hiri, the Slant community recommends Hiri for most people. In the question“What are the best native e-mail clients for Linux?” Hiri is ranked 12th while Sylpheed is ranked 16th.
Ranked in these QuestionsQuestion Ranking
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.
Pro Simple and modern UI/UX design
Con No encrypted mailbox
Likely hasn't been done by anyone since Calypso/Courier back in the 00's.
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.