{
  "draft": "draft-ietf-mailext-smtp-521-03",
  "doc_id": "RFC1846",
  "title": "SMTP 521 Reply Code",
  "authors": [
    "A. Durand",
    "F. Dupont"
  ],
  "format": [
    "TEXT",
    "HTML"
  ],
  "page_count": "4",
  "pub_status": "EXPERIMENTAL",
  "status": "EXPERIMENTAL",
  "source": "Mail Extensions",
  "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.",
  "pub_date": "September 1995",
  "keywords": [
    "simple",
    "mail",
    "transfer"
  ],
  "obsoletes": [],
  "obsoleted_by": [],
  "updates": [],
  "updated_by": [
    "RFC7504"
  ],
  "see_also": [],
  "doi": "10.17487/RFC1846",
  "errata_url": null
}