A tip if you do upgrade, especially from an older macOS and you're using Apple's Mail app: back up your filters. I procrastinated and ended up upgrading from Yo

A tip if you do upgrade, especially from an older macOS and you're using Apple's Mail app: back up your filters. I procrastinated and ended up upgrading from Yosemite (presumably a less well thought out upgrade for obvious reasons), and Mail helpfully deleted all of my filters. Fun times.