Why do mail rules only work when Mac Mail is open?
I moved from POP email to IMAP several months ago. Since the switch, if I call up email on any one of my devices, the rules I have set up in Mac Mail on my iMac (Sierra) won't filter. Manually selecting all and then "apply rules" doesn't always work, either. However, if Mac Mail on my iMac is open, emails will filter into their proper folders.
Any ideas?