Re: [Evolution] Interaction with ProtonMail “Error syncing changes: mailbox 4 does not exist”

[Milan Crha <mcrha redhat com>]

On Tue, 2020-05-26 at 14:57 +0200, Dan Kortschak wrote:
> > The relevant output from CAMEL_DEBUG=imapx:io is as follows:
> >
> > [imapx:A] I/O: 'A00133 UID STORE 338 -FLAGS.SILENT (\DELETED)'
> > [imapx:A] I/O: 'A00133 OK UID STORE completed'

        Hi,
if you still have the log, what is the preceding SELECT command,
please? It seems to me the selected folder (mailbox) is somehow
modified.

> [imapx:A] I/O: 'A00170 UID MOVE 3533 Spam'
> [imapx:A] I/O: '* 3177 FETCH (FLAGS ($junk junk) UID 3533)'
> [imapx:A] I/O: '* 3177 EXISTS'
> [imapx:A] I/O: '* OK [UNSEEN 3] '
> [imapx:A] I/O: 'A00170 NO Label does not exist'

If I understand it correctly, it means they advertise the Spam as a
Junk folder, but do not let you move messages into it. When you open
the mail account Properties, there's an option to use the real Junk (or
Trash) folders on the Defaults tab, which is set for you after the
account is configured if the server advertises such folders. I would
try to not use real Junk folder, which will stop trying to move
messages to that folder in Evolution, though it may have some other
side effects too, like the spam you mark as such in Evolution would not
be recognized by the server as spam (I'm not sure what the server will
do with a message, which has just set the "JUNK" flag).

> Having docs to read to understand this better will still help me
> though.

I'm not sure what documentation you'd like to read, the IMAP 4rev1 is:
https://tools.ietf.org/html/rfc3501.html
with the following additions, extensions and the like. I do not think
it's really something you should care of, as a user.
        Bye,
        Milan