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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 Namecheap

Then, login to your Namecheap account, and go to the Advanced DNS page for the domain you want to verify. Domain Details

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Add MX SPF Record

If you are changing the MX configuration from Gmail to Custom MX, you need to setup new MX records for Gmail. If you don’t setup new records, receiving mail in your gmail inboxes will stop.
Under the Mail Settings section, click the dropdown and select Custom MX:
  1. Type send for the Host of the record.
  2. Copy the MX Value from Resend into the Value field.
  3. Use the Automatic TTL.
  4. Select Save all changes.
Domain Details
Domain Details Below is a mapping of the record fields from Resend to Namecheap:
NamecheapResendExample Value
TypeTypeMX Record
HostNamesend
TTL-Automatic
ValueValuefeedback-smtp.us-east-1.amazonses.com
-Priority10
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).
Namecheap does not label the priority column. It is the empty column after Value. Do not use the same priority for multiple records. If Priority 10 is already in use, try a number slightly higher like 11 or 12.

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Add TXT SPF Record

Under the Host Records section, click Add New Record:
  1. Set the Type to TXT Record.
  2. Enter send into the Host field.
  3. Copy the TXT Value from Resend into the Value field.
  4. Use the Automatic TTL.
  5. Select Save all changes.
Domain Details
Domain Details Below is a mapping of the record fields from Resend to Namecheap:
NamecheapResendExample Value
TypeTypeTXT Record
HostNamesend
TTL-Automatic
ValueValue"v=spf1 include:amazonses.com ~all"
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).

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Add TXT DKIM Records

In that same Host Records section, click Add New Record.
  1. Set the Type to TXT Record.
  2. Enter resend._domainkey into the Host field.
  3. Copy the TXT Value from Resend into the Value field.
  4. Use the Automatic TTL.
  5. Select Save all changes.
Domain Details
Domain Details Below is a mapping of the record fields from Resend to Namecheap:
NamecheapResendExample Value
TypeTypeTXT Record
HostNameresend._domainkey
TTL-Automatic
ValueValuep=MIGfMA0GCSqGSIbRL/a21QojogA+rYqIQXB/3DQEBDAQAB
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).

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Complete Verification

Now click Verify DNS Records on your Domain in Resend. It may take up to 72 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.