Exactly. The reason policy changes like this kill morale is because there are only two outcomes. 1) The problem in the email was not caused by me, yet I am being penalized for it, so I am resentful towards management and the policy abusers. 2) The problem in the email was caused by me, and my coworkers are probably aware of that fact, and now they resent me for bringing about this policy change.
I've been a victim of #1 a number of times and it sucks. It breeds annoyance at anyone you suspect of abusing the policy and every level of management.
If you approach your immediate supervisor with the reasoning of "that's not me, how closely do we need to follow it?" you've put them in an awkward position of "punishing" you or not enforcing it closely and you being an exception. Generally, exceptions are not good and complicate things further.
If people on your team aren't getting things done, go to them directly. We're (mostly) adults.
