I've just discovered that this file (written by Gnus) is almost 50 MB big. I don't need my mail archived locally. How can I tell Gnus not to save it there? (Or, maybe, if possible, for only a very short time, like a week or so).
I've looked here: http://www.gnu.org/software/emacs/manual/html_node/gnus/Mail-Source-Customization.html but this doesn't answer the question. From this I can't understand what exactly is stored in this file, and whether it's ok to delete it.
PS. I also don't want to store outgoing mail there, in case it's stored there. I.e. I don't want Gnus to ever store any mail on my computer for longer than a few days (but would chose not to store it at all if I had to).
Here's an update: I tried, at first, to truncate the file (i.e.
echo '' > ./.emacs-mail-crash-box), which caused some bizarre problems, and Gnus wouldn't connect. But completely removing this file let Gnus connect to my GMail account. I didn't investigate the problem though. The symptoms were these: after starting Gnus it would hang for a while, and when interrupted it would give a message related to missing
'*nnir-something* but grepping the source code I couldn't find where the message was coming from.