const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    messageContent: '<string>',
    smtpEnvelopeInformation: {ehlo: '<string>', mailFrom: '<string>', rcptTo: '<string>'},
    sendingHostInformation: {name: '<string>'}
  })
};

fetch('https://api.mailchannels.net/inbound/v1/report', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.mailchannels.net/inbound/v1/report"

payload = {
    "messageContent": "<string>",
    "smtpEnvelopeInformation": {
        "ehlo": "<string>",
        "mailFrom": "<string>",
        "rcptTo": "<string>"
    },
    "sendingHostInformation": { "name": "<string>" }
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.mailchannels.net/inbound/v1/report",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'messageContent' => '<string>',
    'smtpEnvelopeInformation' => [
        'ehlo' => '<string>',
        'mailFrom' => '<string>',
        'rcptTo' => '<string>'
    ],
    'sendingHostInformation' => [
        'name' => '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

curl --request POST \
  --url https://api.mailchannels.net/inbound/v1/report \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "messageContent": "<string>",
  "smtpEnvelopeInformation": {
    "ehlo": "<string>",
    "mailFrom": "<string>",
    "rcptTo": "<string>"
  },
  "sendingHostInformation": {
    "name": "<string>"
  }
}
'

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}