I use Thunderbird with IMAP and currently try out mutt. When I read messages in mutt, they are not marked as read in Thunderbird. In mutt, they are marked with N or O. I found out that I can toggle the new status (N) with the key N, but old messages are first tagged new, then nothing.

What do I have to set up to mark messages as read as I read them?

  • I did read documentation. It might be caused by a different nomenclauture. But see the Mutt Manual §2.3, where it says about new and old, but nothing about read. In §6 I found mark_old, which toggles the destinction between new and old. So is it just that new and old are both stated of unread, and neither is read? – Martin Ueding Mar 17 '14 at 13:09

Regarding the nomenclature, there are 3 states for an email in mutt:

  • New - message is new and unread (indicated by a N in the first collumn of the index)
  • Old - message is old and unread (indicated by an O in the first collumn of the index)
  • Read - message has been presented to the user (nothing in the first collumn of the index)

If you start mutt and several new messages are in your inbox and you close mutt before you have read them, then those messages will get flagged as old (by default). The behavior can be controlled via the mark_old configuration variable, i.e. writing

set mark_old=no

in .muttrc does removes the disctinciton between old and new. I.e. new messages are always new untill they have been read.

However, note that the status you see in the mutt index is not immediately syncronized to the IMAP server - by default this synchronization is triggered by either quitting mutt or pressing $. Therefore, if you access the IMAP mailbox with another client, changes will appear in this client only after a syncronization has been performed from mutt. Furthermore, if you open a mailbox with mutt and then make changes with another client to that mailbox, mutt will complain about this when synchronizing.

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