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The current configuration doesn't work when moving spam from the INBOX to Junk on a local maildir and then syncing the result to the IMAP server with `mbsync(1)`. This is because `mbsync(1)` doesn't support a mvoe-detection[1] (i.e. an IMAP MOVE which subsequently causes a Sieve COPY according to RFC6851 which then triggers report{h,sp}am.sieve), but instead sends `APPEND` (and removes the message in the src mailbox after that). Tested on my own mailserver that this fixes spam learning. This doesn't work the other way round though because `APPEND` doesn't have an origin. However, learning mails as spam happens more often than learning spam as ham, so this is IMHO still useful. [1] https://sourceforge.net/p/isync/mailman/isync-devel/thread/87y2p1tihz.fsf%40ericabrahamsen.net/#msg37030483