Linux Hint published a tutorial about installing and using MailSpring on Ubuntu 20.04.

How to install and use MailSpring on Ubuntu 20.04

Mailspring is a free desktop email client, available for Windows, Mac OS, and Linux. Mailspring is a powerful email client, taking the best features of Nylas and merging some of its own to produce a high-quality application. It also consists of a Pro Version which adds even more features into the already feature-rich application. In this article, how to install and use MailSpring on Ubuntu 20.04 is explained.

How to install and use MailSpring on Ubuntu 20.04 – Linux Hint