Mutt mail - read / unseen flag not syncing with server Mutt is connected to a Gmail address via IMAP. When a new message arrives, quite rightly it is marked with 'N' within the index. Reading the email, this flag is removed ... however any other clients / gmail.com still displays the email as being unread. I have gone through the Mutt doc but cannot find anything about updating the unseen flag on the server. Is there something I'm missing or is this a limitation to Mutt?

In mutt and neomutt you need to sync mailbox to write changes to the backend. It doesn't matter if the backend is maildir, imap or notmuch.

The function is called `` and is bound to `$` by default. Changing the mailbox to a different one or closing mutt should trigger the sync-mailbox function too.