On Fri, Dec 18, 2020 at 11:16:23AM +0100, Josef Wolf wrote:
Mutt starts up as always and works as expected. But after some time, it stops
to show mail contents. It still shows the sidebar with all existing folders
and the list of messages in the current folder. But no message bodies or
attachments are shown at all.

Are these mbox format mailboxes? When the problem occurs, would you mind trying a few things:

* Try to <pipe-message> to less.

* Without exiting mutt, try changing $tmpdir to an existing temporary directory in your home dir and see if that changes anything:
  :set tmpdir = "~/tmp"

* See if the mutt process is leaking file descriptors by getting the pid and running `lsof -p <pid>`.

Mutt stops not only to show the contents, but also when replying to a mail
with quote, I end up in an emacs with nothing but the header. So mutt forgets
all the mail contents except the header.

Does Mutt even show the attribution header in the reply?

Changing to a different mail or even to a different folder don't help. The
only way is to quit mutt and start again. Then it works again for several
hours or even days, just to eventually stop showing mail contents again.

So, it's able to open the new mailbox, parse it, and display the messages in the index, but you can't view a message or its attachments?

Might this be a problem with the size of my inbox (currently 2.9gB)?

Well, could be, but it would seem like the problem should be immediate in that case.

--
Kevin J. McCarthy
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