curl --request POST \
  --url https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "domain": "mail.acme.com"
}
'

import requests

url = "https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains"

payload = { "domain": "mail.acme.com" }
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({domain: 'mail.acme.com'})
};

fetch('https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains",
  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([
    'domain' => 'mail.acme.com'
  ]),
  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;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains"

	payload := strings.NewReader("{\n  \"domain\": \"mail.acme.com\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"domain\": \"mail.acme.com\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://console.mermail.app/api/v1/workspaces/{workspaceId}/email-domains")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"domain\": \"mail.acme.com\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "ed_01xyz",
  "workspace_id": "ws_01abc",
  "domain": "mail.acme.com",
  "provider": "resend",
  "status": "pending",
  "provider_domain_id": "d_01",
  "region": "us-east-1",
  "dns_records": [
    {
      "type": "TXT",
      "name": "resend._domainkey.mail.acme.com",
      "value": "p=MIGf…"
    },
    {
      "type": "MX",
      "name": "mail.acme.com",
      "value": "feedback-smtp.us-east-1.amazonses.com"
    }
  ],
  "last_error": null,
  "verified_at": null,
  "created_at": "2026-07-15T10:00:00.000Z",
  "updated_at": "2026-07-15T10:00:00.000Z"
}

{
  "error": "Use a custom subdomain such as support.yourdomain.com or mail.yourdomain.com."
}

{
  "error": "Unauthorized"
}

{
  "error": "Invalid request"
}

{
  "error": "Upgrade to Developer to add custom email domains."
}

{
  "error": "Too many requests"
}