15. A few weeks after deploying additional email servers, a company begins to receive complaints from employees that messages they send are going into their recipients' spam folders. Which of the following needs to be updated in order to resolve this issue?

Answer: D

Explanation:

Updating the SPF is necessary to resolve email delivery issues.

To ensure that the emails sent from the company's new servers are not marked as spam, it is essential to update the SPF (Sender Policy Framework) records. This step verifies that the email servers are authorized to send emails on behalf of the domain, helping to improve deliverability.

A) CNAME

CNAME (Canonical Name) records are used to alias one domain name to another. While they are important for DNS management, updating a CNAME record will not directly affect email deliverability or prevent emails from being marked as spam.

B) SMTP

SMTP (Simple Mail Transfer Protocol) is the protocol used for sending emails but does not require updating in this context. The issue lies in the authentication of the sending domain rather than the protocol itself, making this option irrelevant for resolving spam folder delivery issues.

C) DLP

DLP (Data Loss Prevention) is a strategy to protect sensitive data from being lost or misused. It does not pertain to email authentication or the delivery of emails to recipients' inboxes. Therefore, updating DLP will not resolve the issue of emails landing in spam.

D) SPF

Updating the SPF record is crucial because it specifies which mail servers are permitted to send email on behalf of the domain. If the SPF record does not include the new email servers, recipients' email systems may flag messages as spam, leading to the complaints the company is receiving.

Conclusion

Updating the SPF record is the most effective solution to the problem of emails going to spam, as it establishes the legitimacy of the new email servers. Other options, such as CNAME, SMTP, and DLP, do not address the core issue of email authentication, making them ineffective in resolving the situation. Thus, updating the SPF is imperative for ensuring proper email deliverability.