@misc{1195526,
  author = {M C Tracy and W Jansen and K A Scarfone and J Butterfield},
  title = {Guidelines on electronic mail security:},
  year = {2007},
  month = {2007-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.800-45ver2},
  language = {en},
}