[Evolution] Strange new folder

[Jonathan Ryshpan <jonrysh pacbell net>]

A folder named gmane.linux.redhat.fedora.general has just appeared; I
don't remember creating it.  It can't be deleted.
Right-click->Properties does not produce the usual popup.  In
$HOME/.evolution/mail/local it appears as a directory containing a
single file named folders.db .

How this folder was created?  How can it be deleted?

Evolution has been acting weirder and weirder lately, losing messages,
moving folders into subfolders of others, crashing frequently, etc.
What would be a more reliable mail reader?

Thanks - jon