So excited making my 1st newsletter to send to my subscribers. And what is the first thing I see? This! In my very own email! What did I don’t wrong and how can I stop it
Hi there!
This is a warning from your mail provider, it’s not something that you did 
Just like a browser warning, it’s up to the discretion of the mail provider whether they flag the message or not.
My own email flagged it lol
Yep! That happens - public email providers like gmail are especially protective of their recipients. Normal.