BUG: dsync and folder names with "@"

[spamvoll at googlemail.com]

Hello,

dovecot version: 2.3.9.2

When I use dsync:
/usr/bin/dsync -v -D -o plugin/quota= -f -u my at email.dom backup
maildir:/tmp/mailbackup/Maildir
it always stops when it comes to a folder with an "@" in its name.
Error Message:
Warning: Mailbox changes caused a desync. You may want to run dsync again:
Remote lost mailbox GUID (maybe it was just deleted?)

I dont know if it makes a difference, but my dovecot uses mdbox and the
backup export is maildir.

Hans
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