COSS
Domains

Retrieve a sending domain

GET
/v1/domains/{id}

The domain with the result of the last DNS check, so you can show which records are still missing or mismatched.

Authorization

bearerAuth
headerAuthorizationBearer <token>

A secret API key from the dashboard: coss_live_… for production environments, coss_test_… for sandbox environments.

Path Parameters

id*string

The domain's id.

Header Parameters

Coss-Version?"2026-10-10"

The API version (a date) to use for this request. Defaults to your organization's version, pinned to the latest one when it first used the API and upgraded from the dashboard. The SDK always sends the version it was built for.

Value in"2026-10-10"

Response Body

The domain.

application/json
  1. response
object*"domain"
Value in"domain"
id*string
name*string

The domain, lower-cased.

status*string

pending while the records are being checked, verified once they are, temporary_failure after a transient DNS problem, and failed when verification gave up (72 hours) — restart it with the verify endpoint. deleting is a removal in progress.

Value in"pending""verified""temporary_failure""failed""deleting"
can_send*boolean

Whether live keys may send from this domain right now.

region*string|null
mail_from_domain*string

The envelope sender subdomain bounces come back to.

mail_from_status*string
Value in"pending""success""temporary_failure""failed"
records*array<>

The DNS records to publish, with the result of the last check.

created_at*string
Formatdate-time
last_checked_at*|
Formatdate-time
verified_at*|
Formatdate-time
failed_at*|
Formatdate-time
tracking*|null
import { Coss } from "coss";const coss = new Coss({  apiKey: process.env.COSS_API_KEY,  baseUrl: "https://api.coss.com",});const { data, error } = await coss.domains.get("dom_01k7c8m4q2f3e9v6t5r1n0p8yz");
{  "object": "domain",  "id": "dom_01k7c8m4q2f3e9v6t5r1n0p8yz",  "name": "acme.com",  "status": "verified",  "can_send": true,  "region": "us-east-1",  "mail_from_domain": "send.acme.com",  "mail_from_status": "success",  "records": [    {      "priority": null,      "required": true,      "status": "verified",      "found": [],      "purpose": "dkim",      "type": "CNAME",      "name": "x7f3k2m9qp4ld8sv6hwz1nyc5rbtgj0e._domainkey.acme.com",      "value": "x7f3k2m9qp4ld8sv6hwz1nyc5rbtgj0e.dkim.amazonses.com"    },    {      "priority": 10,      "required": true,      "status": "verified",      "found": [],      "purpose": "mail_from_mx",      "type": "MX",      "name": "send.acme.com",      "value": "feedback-smtp.us-east-1.amazonses.com"    },    {      "priority": null,      "required": true,      "status": "verified",      "found": [],      "purpose": "mail_from_spf",      "type": "TXT",      "name": "send.acme.com",      "value": "v=spf1 include:amazonses.com ~all"    },    {      "priority": null,      "required": false,      "status": "verified",      "found": [],      "purpose": "dmarc",      "type": "TXT",      "name": "_dmarc.acme.com",      "value": "v=DMARC1; p=none;"    }  ],  "created_at": "2026-01-15T09:30:00.000Z",  "last_checked_at": "2026-01-15T09:42:10.000Z",  "verified_at": "2026-01-15T09:42:10.000Z",  "failed_at": null,  "tracking": {    "hostname": "links.acme.com",    "status": "active",    "record": {      "type": "CNAME",      "name": "links.acme.com",      "value": "track.coss.com",      "status": "verified",      "found": []    },    "message": null,    "created_at": "2026-01-15T09:45:00.000Z",    "last_checked_at": "2026-01-15T09:52:00.000Z",    "activated_at": "2026-01-15T09:52:00.000Z",    "failed_at": null  }}

Remove a custom tracking domain DELETE

Removes the domain's tracking domain. Later emails use the default tracking host, but links and open pixels in emails already sent through the tracking domain stop working.

List sending domains GET

Every domain of the organization, ordered by name. Domains belong to the organization, not to one environment, so every API key of the organization sees the same domains.