{
  "number": 1846,
  "title": "SMTP 521 Reply Code",
  "authors": [
    "A. Durand",
    "F. Dupont"
  ],
  "published": "1995-09",
  "status": "Experimental",
  "stream": "IETF",
  "area": "app",
  "working_group": "mailext",
  "pages": 4,
  "formats": [
    "TXT",
    "HTML"
  ],
  "abstract": "This memo defines a new SMTP ([1]) reply code, 521, which one may use to indicate that an Internet host does not accept incoming mail.",
  "keywords": [
    "simple",
    "mail",
    "transfer"
  ],
  "draft": "draft-ietf-mailext-smtp-521-03",
  "doi": "10.17487/RFC1846",
  "updated_by": [
    "RFC7504"
  ],
  "urls": {
    "html": "https://rfc.dk/rfc1846/",
    "text": "https://rfc.dk/rfc1846.txt",
    "rfc_editor": "https://www.rfc-editor.org/rfc/rfc1846",
    "datatracker": "https://datatracker.ietf.org/doc/rfc1846/"
  },
  "text_modified": "1995-09-28T19:22:07Z"
}