"junk mailer" meaning in English

{
  "forms": [
    {
      "form": "junk mailers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "junk mailer (countable and uncountable, plural junk mailers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Post",
          "orig": "en:Post",
          "parents": [
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A distributor of junk mail."
      ],
      "id": "en-junk_mailer-en-noun--akOSyhr",
      "links": [
        [
          "post",
          "post#Etymology 2"
        ],
        [
          "distributor",
          "distributor"
        ],
        [
          "junk mail",
          "junk mail"
        ]
      ],
      "qualifier": "post",
      "raw_glosses": [
        "(post) A distributor of junk mail."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "junk mailer"
}

{
  "forms": [
    {
      "form": "junk mailers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "junk mailer (countable and uncountable, plural junk mailers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Post"
      ],
      "glosses": [
        "A distributor of junk mail."
      ],
      "links": [
        [
          "post",
          "post#Etymology 2"
        ],
        [
          "distributor",
          "distributor"
        ],
        [
          "junk mail",
          "junk mail"
        ]
      ],
      "qualifier": "post",
      "raw_glosses": [
        "(post) A distributor of junk mail."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "junk mailer"
}