APP.5.3.A9 Extended Security Safeguards on E-Mail Servers (S)
An organisation's e-mail servers SHOULD check incoming e-mails using the Sender Policy Framework (SPF) and DomainKeys. The organisation SHOULD use DomainKeys and the SPF to authenticate e-mails it sends. If SPF is used, it SHOULD be clearly specified how e-mails are to be handled. The softfail parameter ("~") SHOULD only be used for testing purposes. The organisation SHOULD use Domain-based Message Authentication, Reporting and Conformance (DMARC) to specify how the e-mails it sends should be verified by the receiving e-mail server. DMARC reports SHOULD be evaluated regularly. The organisation SHOULD determine whether DMARC reports on received e-mails are sent to other organisations. The organisation SHOULD secure its e-mail communications via DANE and MTA-STS.
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