The client looks great and I'd like to use it but I frankly don't know what I'm getting. With Thunderbird other solutions you know what it's doing and how. Some of the features of this are a little strange for someone like me.
A lot of the features in the app, like read receipts and link tracking, are targeted at sales and business folks that send a lot of email and care about it being read. You can use the app without using them though! Unlike Nylas Mail, Mailspring implements all mail sync on your computer - your email credentials are not sent to the cloud and things like "unsnoozing" happen on your machine, not on a server. (Note that for many people, this is actually a /bad/ thing - if enough folks complain we might add the cloud sync stuff as an opt-in!)
What does that mean - only support gpg/smime encrypted email, or only support the html-part of a multipart message, with no option to edit/send or view the plain/text part? (ie: you can't communicate with any sane mailinglist using this)?
[ed: and does it work with text/plain at all - or does it effect not support email, sending empty text/plain parts?]
My spit, bubble gum, and duct tape mess of an email client (Thunderbird with one too many plugins) needs to be replaced.