Solutions
Custom Domain Email for AI Agents
Custom domain email for AI agents means your agent sends as agent@yourcompany.com instead of a platform subdomain. Connect the domain, add the DNS records we generate (SPF, DKIM, DMARC), and every agent you create can carry your brand — while its deliverability is still managed per agent.
Brand the sender, keep the isolation
Out of the box an agent sends from its own address on a workspace subdomain — working email in one API call. When you want customers to see your name, connect your domain and the same agent sends as support@yourcompany.com, authenticated end to end.
# agents work instantly on the built-in domain
{ "email": "sarah@acme.mails.ai" }
# connect yourdomain.com and the same agent sends as
{ "email": "sarah@yourcompany.com" }Authentication without the checklist
SPF, DKIM, and DMARC are generated for you — copy the records into DNS and verification completes on its own. Reputation stays per agent, inbound to your domain's agent addresses is parsed and injection-scanned like any other, and pricing doesn't change: $0.001 per send, $0.002 per inbound, no monthly fee for the domain.
Frequently asked questions
What DNS records do I need?
You add the records we generate for your domain — DKIM keys plus SPF and DMARC alignment — and verification runs automatically. Until then, agents work immediately on their built-in mails.ai address.
Does a custom domain risk my company's main email?
Sending is isolated to the agent identities you create and authenticated with its own DKIM selector — and because the platform bans cold email outright, the rail your brand rides on is kept clean by policy, not luck.
Can different agents use different domains?
Yes — domains attach at the workspace level and agents get addresses on them, so a support agent and a billing agent can share a domain while keeping separate addresses, threads, and reputations.
Explore the product
Built for agents.
Self-serve in minutes.
The API is live and self-serve. Drop ~6 lines into your agent and ship.
$ npm install @mailsai/sdk