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Every workspace sends on the shared mail.sentvia.ai domain by default. If you want your agents to send from your own brand — like agent@mail.yourcompany.com — you can add a custom domain. Sentvia provisions the required DNS records and handles authentication automatically. Custom domains are available on Pro plans and above.

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Add and verify a domain

1

Add the domain

Open the dashboard, go to Domains, and add your sending subdomain — for example, mail.yourcompany.com. Sentvia generates the DNS records you need to publish.
2

Publish DNS records

Add the returned DKIM, SPF/MAIL FROM, and DMARC records at your DNS provider. Sentvia polls for them automatically — you do not need to trigger verification manually.
3

Send from it

Once verification passes, create inboxes on your new domain by passing its domain_id to POST /inboxes. Any inbox on that domain sends with your brand in the From header.

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Reputation isolation

Sharing a sending subdomain with other tenants means their sending behavior can affect your deliverability. To avoid this:
  • Scale and up — your domain gets a dedicated sending subdomain, fully isolated from other workspaces.
  • Enterprise — you can run on a dedicated IP for complete reputation control.

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DMARC

Sentvia provisions every custom domain with a DMARC policy from day one. You can ramp the policy as you build sending history:
  1. none — monitoring only; mail is delivered regardless.
  2. quarantine — unauthenticated messages go to spam.
  3. reject — unauthenticated messages are refused outright.
Starting at none and advancing to reject over time is the safe path to a strict, spoofing-proof posture without risking legitimate mail during the transition.
Attempting to add a custom domain on the Free plan returns 402 custom_domains_require_paid_plan. Upgrade your plan from the Billing page.