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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). Using a subdomain allows for proper reputation segmentation based on topics or purpose (e.g. marketing) and is especially important if receiving emails with Resend.

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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.
Domain Details

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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.
Domain Details Domain Details 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;.
Domain Details Domain Details 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).
Domain Details Domain Details Below is a mapping of the record fields from Resend to Strato:
StratoResendExample Value
TypeTypeTXT Record
NameNamesend
ValueValuep=example_demain_key_value
Copy DKIM value using the small copy icon in Resend. DKIM records are case-sensitive and must match up exactly.

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Receiving Emails

If you want to receive emails at your domain, toggle the “Receiving” switch on the domain details page. Enable Receiving Emails for a verified domain
When you enable Inbound on a domain, Resend receives all emails sent to that specific domain depending on the priority of the MX record. For this reason, we strongly recommend verifying a subdomain (subdomain.example.com) instead of the root domain (example.com). Learn more about avoiding conflicts with your existing MX records.
  1. Create a new subdomain named inbound (or whatever your subdomain is).
  2. Navigate to the subdomain settings.
  3. Go to the DNS tab and click on manage MX record.
  4. Select own mail server.
  5. Copy MX value from Resend into Server field.
  6. Use the default priority Low.
  7. Save settings.
Below is a mapping of the record fields from Resend to Strato:
StratoResendExample Value
TypeTypeMX Record
NameNameinbound
Mail serverContentinbound-smtp.us-east-1.amazonaws.com.
PriorityPriorityLow
After verifying your domain, create a webhook to process incoming emails. For help setting up a webhook, how to access email data and attachments, forward emails, and more, see our guide on receiving emails with Resend.

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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.
Review the records you added to Strato to rule out copy and paste errors.