…documented in the defining documents for SPF and DKIM and further discussed in [RFC6377] and [RFC7960]. Domain-based Message Authentication, Reporting, and Conformance (DMARC) [RFC7489] also relies upon SPF and DKIM authentication mechanisms. Failures of authentication caused by …

…fied Mail (DKIM) Development, Deployment, and Operations", RFC 5863, May 2010. [RFC6377] Kucherawy, M., "DomainKeys Identified Mail (DKIM) and Mailing Lists", RFC 6377, September 2011. Crocker, et al. Standards Track [Page 63] RFC 6376 DKIM Signatures September 2011 Appendix A. E…

…ed Mail (DKIM) Development, Deployment, and Operations", RFC 5863 , May 2010. [ RFC6377 ] Kucherawy, M., "DomainKeys Identified Mail (DKIM) and Mailing Lists", RFC 6377 , September 2011. Crocker, et al. Standards Track [Page 63] RFC 6376 DKIM Signatures September 2011 Appendix A …