I would typically make an email alias for a company that was [company-name]@my-domain.com and use that as my contact email for correspondence with said company.
So, I was doing something with the DMV online - and I created the alias "dmv@my-domain.com" to communicate with them via...
They sent their lawyers after me and sent me cease and desist letters telling me that my use of dmv@ was a violation of their copyright and that I would "confuse users"
I tried to explain to the DMV (yes dept of motor vehicles) how ridiculous this whole thing was and that the email address was for their use only - and that as a state agency, they don't have a consumer brand and that anyone with the initials of DMV, like David Michael Vincent would be using DMV in their emails etc...
They persisted and were annoying enough I just deleted their alias...