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After adding a custom domain, add the DKIM, SPF, DMARC, and MX records SentFromAI returned in your Route 53 hosted zone.
1

Open the hosted zone

AWS Console → Route 53 → Hosted zones → select the zone for your domain.
2

Add the DKIM records (CNAME ×3)

Create record → Record name = the *._domainkey… value (Route 53 shows the zone suffix greyed out, so enter only the part before it), Type CNAME, Value = …dkim.amazonses.com.
3

Add SPF + DMARC (TXT)

Type TXT, with the value wrapped in double quotes, e.g. "v=spf1 include:amazonses.com ~all". The _dmarc record likewise.
4

Add the MX records

Type MX, Value in the form 10 inbound-smtp.us-east-1.amazonaws.com (priority then host).
Prefer infrastructure-as-code? The same records map cleanly to aws_route53_record resources in Terraform — one per record, ttl = 300.
SentFromAI verifies automatically once the records resolve. Track status on the Domains page in the dashboard or call POST /domains/{id}/verify.