Which of the following is true regarding the scanning of email contents in Mimecast?

The assertion that email content is scanned for malicious links is accurate and reflects the critical function of Mimecast in protecting users from email-borne threats. When an email is received, Mimecast employs advanced filtering techniques to analyze the entire content of the message, including the body and any links contained within it. This scanning process is essential because many cyber threats, such as phishing attacks or malware distribution, often occur through links disguised as legitimate URLs.

By concentrating on the examination of email content for potentially harmful links, Mimecast can proactively block or flag suspicious emails before they reach the intended recipient, thereby enhancing security. This capability is vital in maintaining email integrity, ensuring that users are safeguarded against potentially destructive cyber activities that could compromise their systems or data.

The other options inaccurately represent how Mimecast functions. The platform does not focus solely on scanning subject lines, nor does it exclude attachments from scanning. Additionally, all emails, including those from external sources, are subject to scrutiny to safeguard organizations from various threats.