User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20151029151421 Steps to reproduce: Why are emails from so many known progressive websites (such as today from foe.org--friends of the earth) consistently tagged as scams? Another example is salsalabs.com, which provides support for many such organizations. I find this behavior rather embarrassing for a product from Mozilla. This bug has been around forever.

It's because those websites are crafting emails with, let's call them "duplicitous links", i.e. links where the clickable text is a URL, but the href points to a *different* URL. Usually, people do this to track whether you clicked the link or not, which is a privacy concern, and can even be a sign of a *real* scam (e.g. the text says "good.com" but the href is "evil.com"). Granted, the former is much more common than the latter. The alert could be reworded to indicate that this is probably just someone trying to violate your privacy rather than trying to actually scam you, but a better way would be for these companies to stop lying to you with their link text. :) I'd say this is already covered by bug 938902.