@techreport{RFC7293,
  title = {{The Require-Recipient-Valid-Since Header Field and SMTP Service Extension}},
  author = {Mills, W. and Kucherawy, M.},
  type = {RFC},
  number = {7293},
  institution = {IETF},
  month = jul,
  year = 2014,
  url = {http://tools.ietf.org/rfc/rfc7293.txt},
}

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