Nicole wants to protect her SMTP email exchanges from being read by others while on the wire. What can she implement to protect SMTP?

Implementing Transport Layer Security (TLS) to encapsulate Simple Mail Transfer Protocol (SMTP) would allow the traffic to be encrypted in transit, protecting it from being read. Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) are both used to prevent spoofing, and Exchangeable Image File Format (EXIF) is information found in an image file.