Seems I can't comment (reputation) but anyhow it's case sensitive:
$ ~/.thunderbird/jbm20yqp.default$ find . -iname "msgfilterrules*"
...../ImapMail/imap.home/msgFilterRules.dat
Uppercase F and R
AFYI. I made it a symlink, so I can use the same rules in multiple accounts (spam is spam wherever it's seen :-) )
It seems my answer was unclear:
- The original answer of "Copy msgfilterrules.dat..." is basically
correct
- It was then questioned WRT "OS differences"
- On Linux (and I'd guess all OS who honour "case" in filenames, the file is actually called: msgFilterRules.dat (note the camel-case)
- The original solution proposed COPYING the file, which works but means you need to make future edits in each copy if the rules.
- Instead I proposed making a symlink (ln -s) so two or more accounts can share their rules
- The symlink works, but be aware the file does not appear to be
read every time it's used (probably only at startup) so edits may not be seen until the next restart
- I ensure I make edits to the ORIGINAL rules (original account) in case the implementation of "edit" recreates the file and so breaks the
symlink.