mail.sentfrom.ai domain out of the box. To
send from your own brand — agent@mail.yourcompany.com — add a custom domain
(available on Pro and up).
1
Add the domain
In the dashboard → Domains → add
mail.yourcompany.com. SentFromAI returns the DNS records to publish.2
Publish DNS records
Add the returned DKIM, SPF/MAIL FROM, and DMARC records at your DNS
provider. SentFromAI verifies them automatically — no need to poll.
3
Send from it
Once verified, create inboxes on the domain by passing its
domain_id to
POST /inboxes.Reputation isolation
On Scale and up, your domain gets a dedicated sending subdomain so your reputation is isolated from other tenants. Enterprise can run on a dedicated IP.DMARC
Custom domains are provisioned with a DMARC policy and can be ramped fromnone → quarantine → reject as you build sending history — the safe path to a
strict, spoofing-proof posture.
Adding a custom domain on the Free plan returns
402 custom_domains_require_paid_plan.
Upgrade from the Billing page.