1. Rename an IMAP account or reorganize/rename folders
~/.claws-mail/folderitemrc should update accordingly, removing entries for non-existing items
It piles up new data keeping the old.
I looked up my own claws (Debian Linux, all updated to 'testing' = Sid) and found my folderitemrc is nearly 2 Mb, with entries dating back to at least 2003.
I create / rename / delete again folders very often, with every new project, and also use arbitrary mail IDs, both of which can be confidental. When i deleted this stuff, i thought it's gne for good now, with no traces except maybe on some unkown server logs.
I maintain some 100 folders or so, but the file contaied probably in the thousands. Because i chose 'telling' folder names, it represents kind of a history of all my mail activities over the past 15 years.
I just deleted the file, including the bak, right away, but now i need to reconfigure all those 'default account' settings, and colors, and templates. Which i leaned on a lot.
I know that special privacy requires special measurements, which i are willing to do only to some limited degree. The point is that i don't like the idea of my mail history (obsolete IDs and folder names) 'archived' in one central place (which is claws in my harddisk), not because i've got so much to hide, but rather by principle; and yes, i fear some kind of trojan sniffer or local attacker.
In a nutshell, it means i can not trust claws.
Please think about a fix.
Michael, you may want to check bug#3982 as it has the same privacy implications which you may want to clean up. *.bak and *_history files could also be considered a privacy issue and IMO there should be an option to either not create them or automatically delete them (in case the program closes normally without crash). Otherwise one could manually link them to /dev/null but that is rather an overkill and may not work properly.
*** This bug has been marked as a duplicate of bug 3952 ***