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Add Domain to Resend

First, log in to your Resend Account and add a domain.

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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Log in to Strato

Log in to your Strato account:

  1. In the left-hand navigation, go to Domains > Manage Domain.

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Add MX SPF Record

  1. On the domain page, click on the gear icon to redirect to Settings.
  2. Create a new subdomain named send.
  3. Navigate to the subdomain settings.
  4. Go to the DNS tab, you’ll see a list of DNS records you can update. Click on manage MX record.
  5. Select own mail server.
  6. Copy MX value from Resend into Server field.
  7. Use the default priority Low.
  8. Save settings.

By default, Strato domains use Strato mail server which uses mail as their send path. You will need to bypass this default behavior by creating a subdomain and setting the MX record there.

Below is a mapping of the record fields from Resend to Strato:

StratoResendExample Value
TypeTypeMX Record
NameNamesend
Mail serverValuefeedback-smtp.eu-west-1.amazonses.com.
PriorityPriorityLow

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Add TXT SPF Record

On the base domain settings:

  1. Go to the DNS tab.
  2. Manage TXT and CNAME records.
  3. On the bottom, click Create another record.
  4. Choose TXT type.
  5. Add send for the name record.
  6. For value input v=spf1 include:amazonses.com ~all.
  7. Save settings.

Strato provides a standard DMARC record similar to Resend’s recommended value: v=DMARC1;p=reject;.

Below is a mapping of the record fields from Resend to Strato:

StratoResendExample Value
TypeTypeTXT Record
NameNamesend
ValueValuev=spf1 include:amazonses.com ~all

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Add TXT DKIM Records

On the same TXT and CNAME manage page:

  1. Click Create another record.
  2. Choose TXT type.
  3. Add resend._domainkey for the Name record.
  4. Copy the record value from Resend into the TXT value field.
  5. Save settings.

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).

Below is a mapping of the record fields from Resend to Strato:

StratoResendExample Value
TypeTypeTXT Record
NameNamesend
ValueValuep=MIGfMA0GCSqGSIbRL/a21QojogA+rYqIQXB/3DQEBDAQAB

Copy DKIM value using the small copy icon in Resend. DKIM records are case-sensitive and must match up exactly.

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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.