When comparing Hexamail Flow vs Seamonkey, the Slant community recommends Hexamail Flow for most people. In the question“What are the best e-mail clients for Windows?” Hexamail Flow is ranked 17th while Seamonkey is ranked 20th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Lots of automated features
Pro Very flexible layout options just using drag and drop
Pro Fast
Pro Gmail support
Pro It's not Outlook
Pro Not just an e-mail client
Seamonkey is more than just an e-mail client as it is a full featured web browser as well. This makes for a good app to use for those that dislike having many different apps on their devices as it is a bit like an all in one solution.
Pro Auto imports setting from Thunderbird
For those that would be making the switch from the Thunderbird e-mail client setup is quite easy with Seamonkey as it auto imports all previous Thunderbird settings.
Cons
Con No way to change font size for viewing list of emails.
Does not work with many fonts on PC.
Con Permanent CPU usage
Seamonkey permanently uses CPU (quite a few percents on a Intel i7). On a laptop this causes the fan to run (which make noise) and the battery to lasts less time.