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Add Domain to Resend

First, log in to your Resend Account and add a domain. Domain Details
It is best practice to use a subdomain (updates.example.com) instead of the root domain (example.com). This allows for proper reputation segmentation based on topics or purpose (e.g. transactional and marketing).

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Login to Hetzner

Login to your Hetzner account:
  1. Choose your Domain from the Your Zones list.
  2. Select the Records tab to get to the page to manage DNS records.
Domain Details

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Add MX SPF Record

In the Create Record section on Hetzner copy and paste the values MX from Resend:
  1. On the Type page, choose MX.
  2. Type send for the Name of the record.
  3. Select the Value field.
  4. Use the default Priority of 10.
  5. Copy the MX Value from Resend into the Mail server field.
  6. Select the TTL of 1800.
  7. Select Add Record.
Hetzner requires your MX record to have a trailing period when adding. Resend will include the trailing period when copying. Removing the period will cause the verification to fail.
Domain Details Domain Details Below is a mapping of the record fields from Resend to Hetzner:
HetznerResendExample Value
TypeTypeMX Record
NameNamesend
Mail serverValuefeedback-smtp.us-east-1.amazonses.com.
TTL-1800
PriorityPriority10
Do not use the same priority for multiple records. If Priority 10 is already in use on another record, try a number slightly higher like 11 or 12.

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Add TXT SPF Record

On the same Create Record section:
  1. On the Type page, choose TXT.
  2. Type send for the Name of the record.
  3. Copy the TXT Value Resend into the Value field.
  4. Select the TTL of 1800.
  5. Select Add Record.
Omit your domain from the record values in Resend when you paste. Instead of send.example.com, paste only send (or send.subdomain if you’re using a subdomain).
Domain Details Domain Details Below is a mapping of the record fields from Resend to Hetzner:
HetznerResendExample Value
TypeTypeTXT Record
NameNamesend
ValueValue"v=spf1 include:amazonses.com ~all"
TTL-10800

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Add TXT DKIM Records

On the same Create Record section:
  1. On the Type page, choose TXT.
  2. Type resend._domainkey for the Name of the record.
  3. Copy the TXT Value Resend into the Value field.
  4. Select the TTL of 1800.
  5. Select Add Record.
Omit your domain from the record values in Resend when you paste. Instead of resend._domainkey.example.com, paste only resend._domainkey (or resend._domainkey.subdomain if you’re using a subdomain).
Domain Details Domain Details Below is a mapping of the record fields from Resend to Hetzner:
HetznerResendExample Value
TypeTypeTXT Record
NameNamesend
ValueValuep=MIGfMA0GCSqGSIbRL/a21QojogA+rYqIQXB/3DQEBDAQAB
TTL-1 hour

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Complete Verification

Now click Verify DNS Records on your Domain in Resend. It may take a few hours to complete the verification process (often much faster).

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Troubleshooting

If your domain is not successfully verified, these are some common troubleshooting methods.