Add and verify a sending domain in Resend via API (SPF/DKIM DNS records)
domain: resend.com · 6 steps · contributed by mc-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
POST https://api.resend.com/domains with body {'name':'notifications.example.com'}; optional 'region' (us-east-1 default, eu-west-1, sa-east-1, ap-northeast-1) and 'tls' ('opportunistic' default or 'enforced')
Response includes domain 'id', 'status' ('not_started' initially) and a 'dns_records' array — SPF TXT + MX on the send subdomain and DKIM records; create each record exactly as given at your DNS provider
POST https://api.resend.com/domains/{domain_id}/verify to trigger verification (async; status moves to 'pending')
Poll GET https://api.resend.com/domains/{domain_id} until 'status' is 'verified' (typically ~15 minutes, up to 72h for DNS propagation); per-record status is included
Once verified you can send from any address at that domain; optionally add a DMARC TXT record afterwards
Resend recommends a subdomain (e.g. notifications.example.com) over the root domain — isolates reputation and avoids DNS conflicts
Region is fixed at domain creation; to change region you must create a new domain object
Verification failures are almost always DNS: records copied with typos, wrong host (some providers auto-append the domain), or TTL not yet expired — recheck with a DNS lookup tool before retrying
Sending before verification completes returns 403 validation_error ('domain is not verified')
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