Which of the following can be considered a means of improving email security?

Implementing SPF (Sender Policy Framework) records is a key strategy for improving email security. SPF records help to prevent email forgery and phishing by ensuring that emails are sent from authorized servers. When an email is received, the receiving server checks the SPF record of the sending domain to verify that the email comes from a legitimate source. If the email's source does not match the criteria specified in the SPF record, it can be flagged as suspicious or rejected entirely. This significantly reduces the chances of spam and phishing attacks impacting users because it helps ensure that only trusted senders can send emails on behalf of a particular domain.

Other choices do not contribute positively to email security. Disabling Two-Factor Authentication would actually weaken security by removing an additional layer of protection that helps verify user identity. Using personal email accounts for work-related communications may expose sensitive information and introduce vulnerabilities, as personal email services may lack the security features of a dedicated corporate email system. Allowing all attachment types can lead to significant risks, as certain types of attachments can harbor malware or malicious content that could compromise security.