Three questions:

1. Duplicate folders on Exchange server.

I am using davmail to sync with an Exchange server. For some reason,
there are two "Sent" folders on the server:

$ mbsync -c ~/.mbsyncrc -l uni
Reading configuration file /home/rob/.mbsyncrc
Channel uni
Opening master uni-remote...
Resolving localhost... ok
Connecting to localhost (127.0.0.1:1143)...
Opening slave uni-local...
IMAP warning: SSL support not available
Logging in...
*** IMAP Warning *** Password is being sent in the clear
Sent
INBOX
Sent

When I use the command `mbsync -c ~/.mbsyncrc uni`, is there a way to
tell mbsync to only sync with "Sent" once, not twice?

2. Plain text passwords.

A nice feature of offlineimap is that the user can encrypt a password
file with GPG. When one sets in the .offlineimaprc file `pythonfile =
~/.offlineimap.py`, where I can call gpg2 to present me with a
password box. Is there an encryption feature in mbsync, rather than
having in plain text `Pass foo` in my .mbsyncrc file?

3. Speeding up IMAP.

See section 4.1.5 in the offlineimap documentation, page 14
https://media.readthedocs.org/pdf/offlineimap/latest/offlineimap.pdf .
Offlineimap has a "quick sync" feature (though I've never got it to
work). It says: "A regular sync will request all flags and all UIDs of
all mails in each folder which takes quite some time. A ‘quick’ sync
only compares the number of messages in a folder on the IMAP side (it
will detect flag changes on the Maildir side of things though).

I have ~30,000 emails in my INBOX. A synchronisation with mbsync takes
about 70 seconds. A (full) synchronisation with offlineimap takes
about 120 seconds. I do not fully understand the mbsync syncing
mechanism, though I understand that all UUID's are requested, and
compared with my local Maildir. Is there a lightweight "quick sync"
feature in mbsync, that for example compares the number of email on
REMOTE and LOCAL, only downloading UUIDs if the folder content size
differs?

In an loosely related question. I have previously used Thunderbird via
davmail, to use my remote Exchange account. I never experienced long
send/receive times, i.e. a few seconds. Moreover, when I send a test
file to my Exchange server, Thunderbird appeared to immediately
receive it (seconds later), despite thee fact that I had configured
Thunderbird to check for mail only every one minute.

Thanks,

--
Rob

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