TY - GEN AU - J. Nightingale C2 - Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD DA - 2017-02-16 DO - https://doi.org/10.6028/NIST.TN.1945 LA - en PB - Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD PY - 2017 TI - Email Authentication Mechanisms: DMARC, SPF and DKIM ER -