On Sat, 25 Aug 2018 07:54:58 +0000 (UTC) Duncan wrote: > Note that various versions of kmail have supported and/or defaulted > to two different formats, maildir and mbox. Claws has a plugin > (mailMBOX) that handles mbox so AFAIK if that's what your kmail is > using, you should be able to simply use that plugin and not have to > do any conversion. However, the mbox format puts all mails within a > single "folder" into the same file, thus eliminating some of the > scriptability options you have with mh-format, and, because there's > multiple mails in one file, it's also a bit less robust as damage to > a single file risks the entire folder's worth of messages. Claws-mail can import mbox files from the 'File' menu. That seems the simplest solution unless there is a lot of folders Personally I use a local Dovecot IMAP server to store my mail, which separates the store from the client. With IMAP, the %F passed to a script is the path to a cache file. (Changes to the file don't propagate back to the IMAP server though.) I would guess that a plugin would create a temporary file per email.