Your customers’ sending domains, verified automatically

DKIMkit handles sending-domain authentication with SendGrid, Postmark, Mailgun or Amazon SES for every customer of your app: DNS records written or shown, verification tracked, and a webhook when each domain is ready to send.

Start free Read the docs

Free for up to 10 domains. No credit card required.

How it works

Register the domainOne API call from your backend, or let customers enter it in the widget.
DNS gets set upWe write the records through Cloudflare or Route 53, or show your customer exactly what to add.
Verified, and you’re toldWe track propagation and your provider’s verification, then send you a signed webhook.

Writes the DNS records

Connect a customer’s Cloudflare or Route 53 and the records are added for them. On any other host, they get the exact records to paste.

Watches until verified

Checks the authoritative nameservers, then your email provider, with backoff. Re-checks verified domains daily and tells you if one breaks.

Embeddable widget

Drop a setup flow into your app with two lines of code. Customers’ DNS credentials never touch your servers or your frontend.

Signed webhooks

Get domain.verified, domain.conflict and more as they happen, signed and retried, so your app updates itself.

Inbound email too

Optionally route replies to your app: the MX record and inbound forwarding are configured in the same flow (SendGrid, Postmark and Mailgun).

Bulk setup, no code

Paste up to 100 domains from any registrar into the dashboard. Each gets sender authentication, and inbound email if you want it, with records grouped by DNS host and a zone file to import.

One call to start

Register a customer’s domain and get the DNS records back immediately. Everything after that happens in the background. Tag domains with your own tenant ids and see usage per customer for your own billing.

API reference →

curl -X POST https://dkimkit.com/v1/domains \
  -H "Authorization: Bearer $API_KEY" \
  -d '{"domain": "customer.com",
       "tenant_id": "cus_42",
       "dns": {"provider": "cloudflare",
               "cloudflare_api_token": "…"}}'

What’s next

What we’re building now and what’s planned after it. Want something else? Request a feature.

Paid plans Coming soonAdd a payment method to go past the free plan’s domains. Pay per active domain, monthly, cancel any time.
Managed DNS Coming soonPoint your domain’s nameservers to us once, and we handle every record from then on, at any registrar.
Buy domains in bulk Coming soonSearch for and register many sending domains at once, right from the dashboard. Each one is authenticated automatically, with no registrar account or DNS setup.
More DNS providers PlannedRecords written automatically at GoDaddy, Namecheap and DigitalOcean, plus Domain Connect where your registrar supports it.
One-click DNS connect PlannedSign in to your DNS provider instead of creating and pasting an API token.
Inbound email for Amazon SES PlannedReceive email on SES domains too, delivered to your webhook like the other providers.

Credentials handled with care

Email provider keys and DNS tokens are encrypted at rest (AES-256-GCM), API keys are stored only as hashes, and the widget runs on our domain so your customers’ DNS credentials never pass through your app. How we handle data

Start free

10 domains free. Paid plans with unlimited domains are coming soon.

Create your free account See pricing