E-Mail software with sync capability

Is there a program written for Linux which sync between devices? By sync I mean e.g.

• account (like Mozilla account)
• QR code scan, like Brave browser

There is a 10y+ wishlist feature for Thunderbird to implement Firefox-like cross-device sync, but I assume the feature won't be implemented in the next 10. Other applications I have tried like Kmail and Sylpheed don't/didn't have this feature when I last used them, some 5 years ago. What is the current state?