Yeah, but I’m too lazy 
and while everyone should be able to add issues to the bug tracker it is far from user friendly…
I find the thread if I search for “Error: invalid filename.” with the forums search btw.
Can't zip mail files in Maildir Dovecot But I did not add to thread that it should be fixed in 2.5.x anyway.
Double reports also don’t really occur very often at this point as well 