Solutions
AI Email Automation Services
AI email automation services split into two shapes: done-for-you agencies that run campaigns on a retainer, and platforms where the automation itself is an AI agent with its own inbox. Mails.ai is the second kind — your agents send, receive, and reply over one API, each from its own authenticated address, priced per call rather than per seat.
Automation that answers, not just sends
Most services sold as email automation automate exactly half the job: the send. Sequences go out on schedule, and the moment a human replies, the automation hands the thread back to you. If your inbox still fills up, you automated the easy half.
Agent-shaped automation closes the loop. Each agent owns an address; outbound goes through one call, and inbound comes back as a structured, injection-scanned event the agent can act on — answer it, escalate it, or file it. The thread history stays with the agent, so follow-ups read like a conversation instead of a campaign.
curl https://api.mails.ai/v1/messages \
-H "Authorization: Bearer $MAILS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"agent": "renewals",
"to": "customer@example.com",
"subject": "Your plan renews on Friday",
"body_text": "Quick heads-up — your plan renews Aug 1. Reply here if you want to change anything and I will sort it out."
}'Priced like infrastructure, not a retainer
Agencies bill retainers; suite platforms bill seats. This rail bills per call — $0.001 per send, $0.002 per inbound — so an agent that handles a few dozen threads a day costs cents. Sends come from your own custom domain, and when a send carries judgment, a draft can wait for human approval before it goes out.
Frequently asked questions
What makes email automation AI different from a classic drip tool?
A drip tool fires a pre-written sequence on a schedule from one shared identity, and the automation ends the moment someone replies. Automation built on agents treats the reply as the interesting part: inbound mail comes back as a parsed, injection-scanned event, and the agent decides what to answer from its own address.
Is this an AI email platform or a done-for-you service?
A platform. You bring the agent — or build one with the SDK or MCP server — and the rail handles addresses, deliverability, threading, and inbound parsing. If you want a team to run campaigns for you, that's an agency engagement; this is the infrastructure those automations run on, priced per call.
Can an AI email agent send cold outreach through this?
No — cold email is prohibited by the acceptable-use policy and blocked at the API. That posture is deliberate: it keeps the shared rail clean, which is why routine agent mail sent here inboxes reliably.
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