I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
It's not closed source see this github.com/Foundry376/Mailspring
From the link you gave:
Mailspring's sync engine is spawned by the Electron application and runs locally on your computer. It will be open-sourced in the future but is currently closed source. (emphasis mine)
Ya, the sync engine is not oss. I was referring to the client itself. Anyway I don't consider that as a negative. Being a OSS developer myself IMO, being closed source doesn't make something bad.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
From the link you gave:
Ya, the sync engine is not oss. I was referring to the client itself. Anyway I don't consider that as a negative. Being a OSS developer myself IMO, being closed source doesn't make something bad.