Context: I'm on a Mac and use Airmail as my email desktop client
Whenever I receive emails where people have typed a smiley face, it shows up as the letter J. So :) becomes J.
I read this could be because the sender is using Outlook and the font Wingdings and that I should setup my mail app to replace the smiley face emoticon :) with an emoji.
Is this really what's happening, and is that the only/best solution?