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Sending domain matching and subdomain settings

From addresses match sending domains regardless of letter case, and custom tracking and inbound subdomains are saved when you update a domain.

Updated Sep 29, 2026

FixedSending domainsEmail APISMTP relayOpen & click trackingInbound email

  • The API and SMTP match the From domain without regard to letter case, so ada@Acme.com sends from the verified domain acme.com.
  • Changing a domain’s tracking or inbound subdomain in the dashboard, or with tracking_key and inbound_key in Update a domain, now saves the new value. Publish the DNS record for the new name and verify it.
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