Error in IMAP command FETCH: Invalid messageset

[pat-s]

This error seems to be caused by a faulty IMAP implementation of the DoveCot mailserver. Our E-Mail Provider uses DoveCot.

The linked mail2most plugin included a fix for this upstream some months ago.

Would something similar be possible for this plugin?

Here is the error message we're facing:

{"level":"error","ts":1613547580.1325433,"caller":"mlog/sugar.go:23","ms
g" :"Failed to poll mailbox","plugin_id":"com.mattermost.mailermost-plugin","error":"Error in IMAP command FETCH: Invalid messageset (0.001 + 0.000 secs)."}

cc @krlmlr