<root@ From contains <root@ bcc@ To or Cc doesn't contain YOUR@EMAIL
cd ~USER/mail/
using Thunderbird’s default boxen for iOS Mail application
ln -s Sent Sent\ Messages ln -s Drafts Saved ln -s Trash Deleted\ Messages
same for Alpine
ln -s Sent sent-mail ln -s Drafts saved-messages
How to Stop Thunderbird Showing ‘Me’ or ‘You’ instead of Your Own Email Address https://www.kuxas.com/148/how-to-stop-thunderbird-showing-me-or-you-instead-of-your-own-email-address
Client issues and configuration https://wiki2.dovecot.org/Clients
IMAP Folders' names with “/” problems for different platforms https://bugzilla.mozilla.org/show_bug.cgi?id=29926
dovecot-postfix imap configuration for thunderbird https://lists.ubuntu.com/archives/ubuntu-users/2013-January/266533.html
Thunderbird should use \Flagged IMAP flag to indicate “Important” https://bugzilla.mozilla.org/show_bug.cgi?id=335293