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

Open Advanced DNS

Namecheap → Domain List → Manage next to your domain → Advanced DNS tab.
2

Enter the Host without your domain

Like GoDaddy, Namecheap appends your domain automatically. In the Host field enter only the part before your domain — e.g. token._domainkey.mail (not …mail.yourco.com). Use @ for the root.
3

Add DKIM (CNAME ×3) + SPF/DMARC (TXT)

Add New Record → choose CNAME Record or TXT Record, set Host and Value exactly as shown. Leave TTL on Automatic.
4

Add the MX records

Add MX Record entries; Namecheap has a separate Priority field — set it to 10. (If “Email” is set to Namecheap’s own service, switch the Mail Settings dropdown to Custom MX first.)
In Host, enter only the part before your domain — Namecheap appends the rest. And make sure Mail Settings is set to Custom MX, or your MX records won’t apply.
SentFromAI verifies automatically once the records resolve. Check the Domains page in the dashboard or call POST /domains/{id}/verify to re-check.