I am Amateur Radio Operator. Commonly called a Ham.😉
I use one of my drones to hang "wire antennas" from trees. I have successfully installed at least half a dozen on my property and several for friends. One of the antennas is an "end-fed that is...
If you have any doubts, I would just ignore all the emails (you are correct, can't trust them) and just go to faa.gov and deal with your business directly there.
I get the reminders but I sure as heck don't click thru; that's a bad bad habit if...