You cannot reasonably expect a person to refuse to even look at a suspicious email. Let's say your support product x at your workplace. From: Person you don't know. Subject: Bug report.

Noone would delete that email without reading it, just like the finance department when they see something claiming to be a bill. Now what if your email said "I have sample website that demonstrates this bug". Again, there's no reason for you to not click that. The only thing that you should be able to reasonably expect a person to "fail" on is getting there and downloading a .exe or providing a set of credentials.