Thunderbird is probably the most popular email client available for Linux. It has got some nice changes last year, including some UI improvements. It’s latest stable version is now v60. On their blog at Mozilla.org they shared some of their plans for 2019.
Thunderbird in 2019
First, they are looking for a new staff to their team so that they would have 14 members altogether.
They are going to review their code and make Thunderbird faster by addressing UI-slowness. This is going to be the main goal for this year.
Many are complaining about Thunderbird’s UI. Although the last release (v60) brought some improvements on this area (Photon UI), the good news is that they will further enhance this area, too. UX/UI improvements are expected this year as well.
Improved notifications and better Gmail support (for example supporting labels) are also part of their plans.