This is not a critical issue, but it's something I'd like to accomplish. I'm also not sure that rules are the way to go, but I'm looking for something fully automated.
I have a correspondent who insists on typesetting his e-mails in Comic Sans. This offends my delicate sensibilities to no end. What I'd like is some automated tool in Outlook that detects the offending font and automatically switches that formatting to almost anything else. (If I can change the target font, great, if it just converts that e-mail to plain text, great. My preference would be Calibri, but again, whatever, as long as it isn't Comic Sans.) I'd like to do this without losing formatting on all e-mails. I don't need to go nuclear here, a surgical strike is exactly what's needed.
Like I said, I'm not sure Outlook rules are the place for this, as those are mostly for filing. (And I've stopped using them as they were creating some maintenance hiccups on my phone.) Even if it's just a macro I'd write, something, that checks the inbox item, looks for Comic Sans, and removes/changes the formatting.