I use Fastmail for my email. Links in Fastmail emails frequently don't work - see the attached video. This video was taken in compatibility mode. The links work fine in Safari. There are no errors produced in the console when I click on the link. There are some fastmail-related errors in the console, but they don't appear to be related to this problem (screenshot below, just in case). If I inspect the link element, then I can see the link in the inspector and click on it there, and that works, so the link in the HTML seems valid.