Begining email correspondence
Since the recipient doesn’t already Know you, you need to send them an introductory email. It must not contain an attachment. Basically, you’re introducing yourself and asking their permission to send email with an attachment that they may otherwise be suspicious of. Tell them who you are, what you’d like to do, and ask for permission to continue.
This introductory email qualifies as the mail Received from you.
Hopefully, they’ll respond; and if they do, honor their wishes. If they choose not to receive email with an attachment from you, don’t send one. If you never hear from them, try your introductory email one more time.
If they accept your offer to receive email with an attachment, send it off. They will Know you and will have Received email from you before. They will also Expect this email with an attachment, so you’ve satisfied the first three requirements of the KRESV tests.
Whatever you send should make Sense to them. Don’t use a provocative Subject line or any other social engineering practice to encourage them to read your email.
Check the attachments for Viruses. This is again based on having virus-checking programs, and we’ll discuss that later.