Advertisement Spam, Mail Interception (Filters), and Social Engineering

Prevention of social engineering mail spam

Why did I not receive this mail?
This is the first step and easiest step to take. It is strongly recommended that you diligently carry out this step. That is, ask “Who sent this mail to me?” “Who is the sender?”
Please be reminded that “the name of the sender” and “the sender’s email address” could be fakes.
Ask yourself, “Was I supposed to receive this email?”
Pay attention to “email content”: that includes the subject and what it refers to
Does it have something to do with me?
Is the content reasonable?
Are there any threatening or blackmail words?
Can it be a scam?

Is it necessary for me to open the attachment or click a link?
It is very risky to open an unknown attachment or click an unfamiliar link, since the action will risk a virus infection or a Trojan spreading to your system.