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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 IONOS

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

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Add MX SPF Record

Select “Add record” on IONOS to copy and paste the values MX from Resend.
  1. On the Add a DNS Record page, select MX.
  2. Type send for the Name of the record.
  3. Copy the MX Value from Resend into the Points to field.
  4. Use the default Priority of 10.
  5. Use the default TTL of 1 hour.
  6. Select Save.
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 IONOS:
IONOSResendExample Value
TypeTypeMX Record
NameNamesend
Points toValuefeedback-smtp.us-east-1.amazonses.com
TTL-1 hour
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

In the same section, select “Add record” again.
  1. On the Add a DNS Record page, select TXT.
  2. Type send for the Host name of the record.
  3. Copy the TXT Value Resend into the TXT value field.
  4. Use the default TTL of 1 hour.
  5. Select Save.
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 IONOS:
IONOSResendExample Value
TypeTypeTXT Record
Host nameNamesend
TXT valueValue"v=spf1 include:amazonses.com ~all"
TTL-1 hour

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Add TXT DKIM Records

In the same section, select “Add record” again.
  1. On the Add a DNS Record page, select TXT.
  2. Type resend._domainkey for the Host name of the record.
  3. Copy the record value from Resend into the TXT value field.
  4. Use the default TTL of 1 hour.
  5. Select Save.
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 IONOS:
IONOSResendExample Value
TypeTypeTXT Record
Host nameNamesend
TXT 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.