I just re-ran my original test..........
Command-i brought up my Apple Mail with this page in the body and the Subject of the email was "Help, please! :)". I sent it to myself and it both went and was received without incident.
........and the results were exactly the same.
With the mention of Command-l in the thread, I did another test and found that issuing that Command-l using the keyboard does nothing.
However, my Safari File shows Command-l as the keyboard equivalent for "Mail Contents of this Page".
And, if I go to File and select "Mail Contents of this Page", I get the same result as typing Command-i on the keyboard.
So it appears that it's Command-l in one place but Command-i in another.