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Glossary · Published 2026-09-29 · AgentiSend team

Sending domain

Sending domain: A domain you verify, then send from. An unverified From is refused.

POST /domains adds the domain. Publish the records from GET /domains/{id}, then POST /domains/{id}/verify. DKIM and both return path records are what a new domain must resolve. The SPF and DMARC records are recommended and do not block sending.

The From address has to be on a verified domain. DKIM alignment is the signature on that same domain. Free includes 3 verified domain.

Related terms

  • DKIM alignment — The signing domain and the From domain match, or they share one organisation domain.
  • Return path — The MX and TXT on your domain that receive bounces and keep the envelope aligned.