This thread seems to closely detail my problem but no solution seems to be listed.
I use SaneLater with my Apple iCloud email address. On my MacPro I’m running 10.9.4 with Apple Mail 7.3.
Emails are correctly going into my @SaneLater folder and being marked as Spam but they then not automatically moving to my Spam folder (Location: On My Mac).
When I look in the Spam folder a duplicate message is also listed there.
If I manually then run my ‘rules’ the messages moves from @SaneLater and only exists in the Spam folder.
I’d love for this to all happen automatically.
I noted the above suggestion about renaming the spam folder but in iCloud my folder is name ‘Junk’