Its saying basically that there are hidden secrets underneath people. That every smile, nod or wave has a hidden agenda. It's like warning to be wary of who you trust.
What is the article called? because without the article i don’t understand the question so do you have a link to it or picture
I believe the answer is: While the e-mail contains formal language in the body, the salutation is formatted incorrectly and the contact information is missing.
The contact information should be placed on top of the format question so the receiver know where he/she should send the reply.
Before placing salutation, it is important to address the name and position of the person who receive the salutation.