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After adding a custom domain, add the DKIM, SPF, DMARC, and MX records SentFromAI returned in GoDaddy.
1

Open DNS management

GoDaddy → My Products → your domain → DNS → Manage Zones / Add Record.
2

Enter the subdomain part only

GoDaddy automatically appends your domain to the Name field. So for a record named token._domainkey.mail.yourco.com, enter just token._domainkey.mail — without the trailing .yourco.com. (For a record at the domain root, use @.)
3

Add DKIM (CNAME ×3), SPF + DMARC (TXT), and MX

Add each record with its Type, the Name adjusted as above, and the Value/Points-to exactly as shown. MX records use Priority 10.
The most common GoDaddy mistake is leaving the full hostname in Name — GoDaddy then creates token._domainkey.mail.yourco.com.yourco.com. Enter only the part before your domain.
SentFromAI verifies automatically once the records resolve. Check the Domains page in the dashboard or call POST /domains/{id}/verify to re-check.