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What is a domain

A domain is used to send emails using your own domain. Verifying a domain is a required step because it’s essential to ensuring the deliverability of your emails.

In order to verify a domain, you must set the DNS entries that grant us permission to send email on your behalf.

View domain details

Get information about your domain name, its verification status, and history.

Domain Details

What are SPF records

Sender Policy Framework (SPF) is an email authentication standard that allows you to list all the IP addresses that are authorized to send email on behalf of your domain.

The SPF configuration is made of a TXT record that lists the IP addresses approved by the domain owner. It also includes a MX record that allows the recipient to send bounce and complaint feedback to your domain.

SPF Records

What are DKIM records

DomainKeys Identified Mail (DKIM) is an email security standard designed to make sure that an email that claims to have come from a specific domain was indeed authorized by the owner of that domain.

The DKIM configuration is made of a TXT record that contains a public key that is used to verify the authenticity of the email.

DKIM Records

Understand a domain status

Domains can have different statuses, including:

  • Not Started: you’ve added a domain to Resend, but you haven’t clicked on Verify DNS Records yet.
  • Pending: Resend is still trying to verify the domain.
  • Verified: your domain is successfully verified for sending in Resend.
  • Failure: Resend was unable to detect the DNS records within 72 hours.
  • Temporary Failure: for a previously verified domain, Resend will periodically check for the DNS record required for verification. If at some point, Resend is unable to detect the record, the status would change to “Temporary Failure”. Resend will recheck for the DNS record for 72 hours, and if it’s unable to detect the record, the domain status would change to “Failure”. If it’s able to detect the record, the domain status would change to “Verified”.

Open and Click Tracking

Open and click tracking is disabled by default for all domains. You can enable it by clicking on the toggles within the domain settings.

Open and Click Tracking

How Open Tracking Works

A 1x1 pixel transparent GIF image is inserted in each email and includes a unique reference to this image file. When the image is downloaded, Resend can tell exactly which message was opened and by whom.

How Click Tracking Works

To track clicks, Resend modifies each link in the body of the HTML email. When recipients open a link, they are sent to a Resend server, and are immediately redirected to the URL destination.