> are you 100% free to cheat on cyber security measures?
Why do you think that implementing an email filter like that is "defying a measure" or "cheating"? What value do you think there would be in individually, manually, reviewing each such email, if you've already identified the pattern they all follow and their purpose? You're essentially arguing for wilful inefficiency, which is "cheating" the organization out of useful labor.
The other reply to you may have been less than perfectly polite, but they certainly had a point.