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Assessment Title
Rule Text
An IIS Server must be configured to be a SMTP relay must require authentication.
Description
Discussion Text
Anonymous SMTP relays are strictly prohibited. An anonymous SMTP relay can be a vector for many types of malicious activity not limited to server exploitation for the sending of SPAM mail, access to emails, phishing, denial-of-service (DoS) attacks, etc. Enabling TLS, authentication, and strictly assigning IP addresses that can communicate with the relay greatly reduce the risk of the implementation.
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