I just don't believe there is no filter anywhere. Example: I want the email address john@... clearly that should not be allowed, because potentially sensitive

I just don't believe there is no filter anywhere. Example: I want the email address john@... clearly that should not be allowed, because potentially sensitive emails might be directed at the wrong John. This happened all the time at my company, and people got irritated at me for disallowing first name login names. I even had the example, at one point, of 3 David's working for us. So, all this push back on my original statement has me really thinking the replies are completely disingenuous. It's just too easy to come up with a reasonable case where a name should not be allowed.