I am in the
t mode now, which mails mails are sorted according to thread.
Why don't the numbers start from 2, then 3?
This is supposed to be the number of lines in the message.
If you are using the mbox format, where mutt has to parse the entire file, then it counts the number of lines in each message as it is reading the mailbox and this count will be shown here. You may be using IMAP, where mutt does not know the size of a message until it is fetched from the server. Or you may be using the maildir format, which has a significant advantage over mbox format in that mutt only has to read the headers of each message. This will usually be much faster, if you have any large messages in your mailbox. Using the maildir format mutt can still get the number of lines in the message, but only if the message has a
If you don't particularly care to see the number of lines in each message but you would like to use the screen space to show something useful, you can set