Agent Mail for AI agents | eesier

Email infrastructure for AI agents

Give your agent an inbox built for millions.

Connect eesier Agent Mail to Claude, ChatGPT, or any agent. It can create an inbox and send its first email in minutes—then keep the same connection as volume grows to millions every month.

  • A real inbox with complete threads and replies
  • Domains, DNS, IPs, warm-up, pacing, and reputation managed for you
  • Queue any workload; send at the fastest velocity the infrastructure can sustain safely
Give my agent email See how it works

No SMTP setup. No deliverability team. No Eesier AI agent included.

Why can't an AI agent just send email at scale?

An AI agent can research prospects and write a good message, but it does not arrive with a mailbox, domain reputation, durable queue, receiving infrastructure, or a safe way to reach millions of people. Agent Mail supplies that missing operational layer.

A send button is not a mailbox

A basic tool can submit one email. It does not create a durable identity, receive replies, preserve threads, process bounces, or tell the agent what happened next.

Volume changes the problem

At high volume, domains, IP pools, provider limits, queues, retries, suppressions, reputation isolation, and capacity forecasting become the product.

Every reply needs a way back

Inbound messages must land in the original conversation and wake the right agent immediately, without polling or reconstructing context.

How does eesier Agent Mail get an agent sending?

Connect Agent Mail once. Your Claude, ChatGPT, or custom agent can then create a real identity, submit any size workload, receive a safe delivery plan, and continue every conversation from the same thread.

  1. 01

    Connect your agent

    Add Agent Mail to Claude, ChatGPT, or your application through MCP, REST, an SDK, or SMTP relay.

  2. 02

    Create its identity

    Start on a managed development address, connect your own domain, or register a new domain through eesier.

  3. 03

    Queue the workload

    Send one message or submit millions with schedules, priorities, deadlines, budgets, and idempotency keys.

  4. 04

    Let eesier deliver

    Agent Mail selects healthy capacity, ramps new infrastructure, paces providers, retries temporary failures, and protects reputation.

  5. 05

    Wake on every reply

    Replies return to the original thread and reach the agent through MCP, API, WebSocket, or a signed webhook.

What happens when an agent queues one million emails?

Agent Mail accepts the complete workload, measures the healthy capacity available, and returns an honest execution plan. It does not confuse unlimited queue intake with an unlimited immediate blast.

Choose an example monthly workload
Monthly queue 1,000,000
Illustrative daily average 33,334 / day
Capacity model Reserved managed capacity
Delivery control Pool + provider isolation

These examples show how the operating model changes with scale. A real plan also considers domain age, audience quality, recipient-provider mix, sending windows, and current reputation.

How does Agent Mail protect deliverability?

Agent Mail continuously manages the infrastructure and sending behavior that mailbox providers use to judge a sender. It authenticates every identity, builds reputation gradually, watches health signals, adapts velocity, and isolates damage before one problem spreads.

Automatic authentication

SPF, DKIM, DMARC, MX, TLS, return paths, and reverse DNS are configured and continuously verified.

Adaptive reputation ramping

New domains, senders, and IPs increase volume according to real delivery signals—not a fixed warm-up checkbox.

Provider-aware pacing

Gmail, Microsoft, Yahoo, and private hosts receive independent velocity, concurrency, and retry policies.

Continuous health monitoring

Authentication, reputation blocks, deferrals, complaints, bounces, DMARC reports, and relevant blocklists stay under watch.

Failure classification

Invalid recipients, temporary deferrals, provider policies, authentication faults, and reputation incidents trigger different responses.

Automatic suppression

Hard bounces, complaints, unsubscribes, invalid recipients, and customer blocklists stop damaging future sends.

Is it a real mailbox or only a send endpoint?

It is a persistent, two-way mailbox built for agents. Every sent message, inbound reply, attachment, thread, delivery event, and failure remains available through MCP, API, webhook, or the human console.

Persistent agent identity

Give each agent, tenant, customer, workflow, or brand its own recognizable address and auditable history.

Complete conversations

Sent mail, replies, CCs, forwards, attachments, labels, and RFC-compliant threading remain together.

Instant inbound events

Signed, retried, replayable events notify the agent about replies, deliveries, deferrals, bounces, complaints, and unsubscribes.

MCP control, bulk data plane

One agent tool call can create a million-message job while the bulk API moves the workload efficiently.

agent_mail.create_send_job MCP 
{
  "inbox": "[email protected]",
  "messages": 1000000,
  "send_window": "recipient_local_time",
  "reply_webhook": "https://agent.example/replies",
  "delivery_policy": "protect_reputation"
}
job_01JAM8K4

Capacity planned · queue active · replies connected

Does eesier Agent Mail include an AI agent?

No. Agent Mail is intentionally only the email infrastructure. You choose and control the intelligence; eesier makes its mailbox work reliably.

Your agent decides

  • Who to contact
  • What to say
  • When to follow up
  • How to qualify and respond

eesier operates

  • Inboxes, domains, DNS, and IPs
  • Queues, schedules, pacing, and retries
  • Warm-up, reputation, health, and suppression
  • Threads, inbound mail, and reply events

There is no hidden Eesier SDR, lead list, copywriter, or campaign strategy inside Agent Mail. It is the managed email layer beneath the agent you already chose.

Born inside eesier

Infrastructure built by operating a real autonomous prospecting agent.

Agent Mail turns the sending, receiving, threading, monitoring, and deliverability infrastructure behind eesier's own B2B agent into a product any agent can use.

430,000+ unique emails sent by eesier
22,000+ responses processed

How is Agent Mail priced?

Pay for the infrastructure you use—not seats. Pricing scales across active identities, email processing, and the dedicated capacity required to protect reputation at higher volume.

Developer

For building and testing your first agent mailbox.

Start free
  • One managed inbox
  • Development email allowance
  • MCP and API access
  • Managed development address
  • Webhooks and basic logs
Start building
Production

Usage

For production agents with growing, variable traffic.

Usage based
  • Active inbox + per-1,000 pricing
  • Connected and registered domains
  • Bulk queue and scheduling
  • Complete inbound mailbox
  • Deliverability controls and analytics
Estimate my volume

Dedicated

For hundreds of thousands to millions every month.

Custom capacity
  • Managed dedicated IP pools
  • Reserved warmed capacity
  • Traffic and tenant isolation
  • Provider-level telemetry
  • Volume commitments, SLA, and priority support
Plan my infrastructure

Frequently asked questions

The practical details behind an agent-owned mailbox

Is eesier Agent Mail another AI sales agent?

No. Agent Mail does not find leads, write copy, decide strategy, qualify prospects, or sell anything. It is the managed email infrastructure beneath your Claude, ChatGPT, or custom agent.

Can my agent really send one million emails?

It can queue a one-million-message workload immediately. The completion time depends on healthy domains, senders, IP capacity, provider mix, and audience quality. Agent Mail returns a delivery plan and can prepare dedicated capacity instead of damaging reputation to meet an impossible deadline.

Do I need my own domain?

Not for development. You can start with a controlled eesier-managed address. For production and meaningful volume, connect a domain you own or register a dedicated domain through eesier so your identity and reputation remain isolated.

Does Agent Mail guarantee inbox placement?

No honest provider can guarantee that every message avoids spam. Agent Mail manages the infrastructure and sending-behavior variables it can control, detects problems early, and adapts delivery. Audience quality, relevance, content, and recipient behavior still matter.

What happens when somebody replies?

The reply is stored in the original thread and triggers a signed message.received or message.replied event. Your agent can read and answer it through MCP or API, and webhooks retry automatically if your endpoint is temporarily unavailable.

What happens if a domain or IP is blocklisted?

Agent Mail isolates the affected resource and traffic, slows or pauses the relevant sends, preserves healthy capacity, investigates the signals, begins the appropriate remediation workflow, and returns the resource gradually only after it recovers.

Is Agent Mail only available through MCP?

No. MCP is the simplest control surface for agents. REST, SDKs, SMTP relay, bulk uploads, webhooks, and WebSockets support applications and high-throughput workloads.

Can I use Agent Mail for B2B outreach?

Yes, for lawful and relevant outreach that follows the acceptable-use policy and the rules that apply to your recipients. Authentication, unsubscribes, complaints, suppressions, transparent identity, progressive limits, and high-volume review are enforced as infrastructure controls.

From send to reply

Your agent is ready to send. The infrastructure should be too.

Create its inbox, connect its domain, queue the workload, and let eesier manage everything required to deliver reliably at scale.

Give my agent email Bring your own agent. eesier supplies only the email infrastructure.
Give your agent email