After marking an email as read the synchronization lasts forever


When I mark any email as read or unread the mailspring starts “Syncing your mailbox…” with status “Marking as read” or “Marking as unread” and it lasts forever. In this case, the application heavily loads the processor. Closing-opening the app fixes the problem.


I try to reproduce the issue with different Gmail accounts. It reproduces on accounts with thousands of emails but never happened on accounts with hundreds of emails.

Email Provider


  • OS and Version: Ubuntu Linux 20.04
  • Installation Method: snapcraft and deb tested. The issue is on both
  • Mailspring Version: 1.9.1

A post was merged into an existing topic: The Eternal Sync Bug