I have several accounts connected to my Mailspring client, including both IMAP and GMail accounts. I tend to work by reading and replying to emails in the Inbox, and then filing them into folders to keep the Inbox clear (basically, I use the Inbox as a To Do list).
When I file an email from a GMail account into a folder (i.e. apply a label, in GMail-speak), it is properly saved into that folder/label. However, the email thread will often pop up again in my Inbox, anything from a day or so to many days later. Looking at the email, I see only the Inbox label has been applied to it (as shown at the top of the message viewer), and not the label that I had manually applied (and that it present when I view the email in its folder).
I will re-apply the label and the email is removed from my Inbox, but will often re-appear.
It’s not clear which emails will do this, but I believe it’s generally the most recent email and its ancestors.
Only GMail accounts show this problem - I don’t believe I’ve ever seen it with IMAP accounts. And I’ve never seen it with GMail accounts via either the web interface or other mail clients.
- Label an email in a GMail account.
- The mail is moved to the folder out of the Inbox.
- Wait several days…
The mail remains in the assigned folder permanently
Kubuntu 21.04, Mailspring 1.9.2 (deb).