imaplib does not qupote mailbox names when it's sending it's query to the server in response to a status request, for example. This will lead to very strange errors if mailboxes are accessed which contain spaces:

i.e.

connection.status("mailbox name", "(MESSAGES)")

will return

  File "/home/joe/test/imaplib.py", line 920, in _command_complete
    raise self.error('%s command error: %s %s' % (name, typ, data))
imaplib.error: STATUS command error: BAD [b'Error in IMAP command STATUS: Status items must be list.']

which indicates that the error is within the actual flag list. It is not, however:

connection.status("\"mailbox name\"", "(MESSAGES)")

works as expected. This may arguably be or not be a bug -- however it is REALLY confusing to the user. Maybe at least a note should be included somewhere that -- just to be safe -- mailbox names should be quoted.

All the best,
Joe

@Joe sorry for the delay in getting back to you.

@David is this within your remit?

Yes.  It will be necessary to check the RFC to figure out what should be done here.

Joe is correct, according to the spec the names containing special chars (atom-specials) require names to be quoted (https://tools.ietf.org/html/rfc3501#section-5.1): 

   1)    Any character which is one of the atom-specials (see the Formal
         Syntax) will require that the mailbox name be represented as a
         quoted string or literal.

I'll be working on a patch for that.

Currently working on a patch for this.

From imaplib.IMAP4 class description we're stating to quote parameters if necessary. This patch adds that capability according to https://tools.ietf.org/html/rfc3501#section-5.1

siemer thx for the comments in the review. I'll try to address them by the end of this week.

Pull Request opened on GH to fix this issue: https://github.com/python/cpython/pull/6395