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What are domains?

A domain is the foundation of your sending identity in SendKit. Before you can send any email, you need to add and verify at least one domain. This proves you own the domain and authorizes SendKit to send on your behalf. For example, if you want to send emails from hello@acme.com, you need to add and verify acme.com.

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Adding a domain

1

Go to Domains

Navigate to Domains in the sidebar and click Add Domain.
2

Enter your domain name

Type your domain (e.g., acme.com). Do not include subdomains or protocols.
3

Select a region

Choose the region closest to your recipients for best performance. This cannot be changed after creation.
4

Configure DNS records

SendKit generates 4 DNS records you need to add at your DNS provider. See DNS records below.
5

Verify

After adding the records, click Refresh on the domain detail page. Verification usually completes within minutes, but DNS propagation can take up to a few hours.

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DNS records

When you add a domain, SendKit generates 4 DNS records. You need to add these at your DNS provider (Cloudflare, AWS Route 53, GoDaddy, etc.).

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DKIM (required)

DKIM cryptographically signs your emails so recipients can verify they haven’t been tampered with.
The DKIM public key is unique to your domain and generated automatically by SendKit. Copy the full value from the domain detail page.

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SPF (required)

SPF tells receiving mail servers that SendKit is authorized to send emails for your domain.

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MX (required)

The MX record on the send subdomain enables bounce and complaint handling.
The exact MX value depends on the region you selected. Copy it from your domain detail page.

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DMARC (optional)

DMARC builds on top of DKIM and SPF to define how receiving servers should handle unauthenticated emails.
DMARC is not required for verification, but we strongly recommend adding it. It protects your domain from spoofing and improves deliverability.

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Verification

After you add the DNS records at your provider, come back to the domain detail page and click Refresh. SendKit checks both your DNS records and the email identity status.

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Statuses

If a verified domain loses its DNS records (e.g., someone removes them), SendKit detects this automatically and disables sending. You’ll receive an email notification and need to re-add the records.

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Automatic checks

You don’t need to keep clicking Refresh. SendKit automatically checks pending domains:
  • First 2 hours — every 10 minutes
  • 2–12 hours — every 30 minutes
  • 12–72 hours — every 60 minutes
After 72 hours, automatic checks stop. You can still verify manually at any time.

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Domain configuration

Once added, you can configure tracking and security settings from the Configuration tab:

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Click tracking

When enabled, links in your HTML emails are rewritten to pass through SendKit before redirecting to the original URL. This lets you track which recipients clicked which links.

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Open tracking

Not recommended. Many email clients block tracking pixels, making open data unreliable. It can also affect deliverability.
When enabled, a 1x1 transparent pixel is inserted into each email to detect when it’s opened.

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TLS mode

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Domains and senders

Domains and senders work together:
  • A domain must be verified before you can create senders on it
  • Each sender uses an email address on a verified domain (e.g., hello@acme.com)
  • If a domain loses verification, all senders on that domain are disabled until re-verified

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Domain warmup

New domains go through an automatic warmup period to build sender reputation. During warmup, daily sending volume is gradually increased over 7 days. The schedule varies based on your domain’s age — younger domains get a more conservative warmup.

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Deleting a domain

A domain can only be deleted if it has no senders. Remove all senders first, then delete the domain from the dropdown menu on the domain detail page. When a domain is deleted:
  • The domain and its DNS records are removed from SendKit
  • All associated infrastructure is cleaned up automatically
  • You can remove the DNS records from your provider
Deleting a domain does not affect emails that were already sent.

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FAQ

The number of domains depends on your plan. Check your plan details for the domain limit.
Yes. You can add mail.acme.com or any subdomain. The DNS records will be generated for that subdomain.
Most DNS providers propagate changes within minutes. In rare cases, it can take up to 24-48 hours depending on your provider and TTL settings.
DKIM, SPF, and MX are required for verification. DMARC is optional but strongly recommended for better deliverability and domain protection.
Choose the region closest to the majority of your recipients. This reduces latency and can improve delivery speed. The region cannot be changed after domain creation.
No. Each domain is unique per team. However, different teams can use different subdomains of the same root domain.