An administrator observes frequent message rejections because messages fail alignment checks. Which measure helps ensure recognized providers trust messages from the domain and reduces rejections?
Deploy ephemeral key schemes at the mail gateway
Adopt cryptographic signatures for message confidentiality
Add a specialized domain configuration entry that enumerates valid sending servers
Blacklist suspicious IP addresses through the organization’s firewalls
Creating a specialized domain configuration entry that enumerates valid sending servers is recommended. This indicates precisely which mail hosts are authorized to originate messages, satisfying alignment checks imposed by external providers. Deploying ephemeral key schemes helps with encryption in transit rather than telling recipients which hosts are valid. Using cryptographic signatures for confidentiality focuses on protecting message contents, not identifying the originating servers. Blacklisting suspicious IP addresses has value for security but does not establish trust in legitimate senders.
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