Email Sending for Platforms, Not Just Apps

Let your customers, tenants, and AI agents send email — without one bad sender taking down your whole account.

Built for Platforms with Many Downstream Senders

Generic email APIs deliver messages. MailChannels delivers a safer operating model — so the bad behavior of one tenant, customer, or agent doesn’t suspend your account or sink everyone’s deliverability.

Tenant and Agent Isolation

Each sender — customer, workspace, or AI agent — gets its own identity, policies, rate limits, and suspension path. One bad actor can’t cause a platform-wide outage.

Abuse Operations, Managed

We’ve spent over a decade running the hardest version of this problem: outbound abuse for web hosts. That detection and response layer is built into the API.

Per-Sender Reputation Tracking

We track reputation at the individual sender level — not just at the account or IP — because that’s how mailbox providers increasingly evaluate mail.

Safe Suspension Paths

Webhook-driven enforcement lets you rate-limit, pause, or cut off a single bad sender automatically — without disrupting legitimate traffic.

Your ESP Account Is the Single Point of Failure

When one customer abuses your shared email account, the damage doesn’t stop with that tenant. Receivers throttle or suspend your sending privileges, and every other customer’s mail stops flowing with it. MailChannels is built so one bad sender can’t take the whole platform down.

Per-Tenant Visibility

See volume, complaints, bounces, and behavior for every downstream sender — not just an aggregate account view.

Real-Time Abuse Signals

Get notified the moment a sender’s behavior turns risky, so you can act before receivers do.

Policy You Control

Set rate limits, content rules, and enforcement thresholds per tenant, plan tier, or agent class — and let the API enforce them automatically.

Why “Just Give Them a Dedicated IP” Isn’t the Answer Anymore

Mailbox providers like Gmail and Microsoft no longer rely on IP addresses alone. They evaluate the entire infrastructure path — the sending domain, the platform behind it, and the patterns of every sender that shares it. A dedicated IP can’t protect you when the platform identity around it gets flagged. Per-sender isolation can.

MailChannels protects more domains
from email abuse than any other provider

100M+

Messages processed daily on infrastructure built for AWS autoscaling

Of the top 100 web hosting providers trust MailChannels with their email

Reduction in email-delivery support tickets reported by Rebel after switching

The Controls Platform Operators Actually Need

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Sub-Account Architecture

Provision a distinct sender identity for every tenant, workspace, or agent with one API call. Reputation, limits, and policy are scoped to that identity.

Bounce and Complaint Webhooks

Get structured feedback for every delivery event — including FBL complaints — so your platform can route, retry, suspend, or escalate without polling.

Inline Threat Filtering

Outbound messages are scanned for phishing, malware, and known abuse patterns before they leave the network — protecting your sending reputation in real time.

Approval Hooks for Agents

Insert a human or programmatic checkpoint into the send path — useful for AI agents where you want oversight before high-risk messages go out.

SMTP and REST Endpoints

Use the REST API for clean integration or the SMTP relay for legacy code and BYO-mail-server scenarios. Same controls, same isolation, either path.

Per-Sender Logs and Audit Trails

Full message-level history scoped to each tenant or agent — for support, compliance, and incident review.

“MailChannels has been a game-changer for me; they are quick to reply to support requests, mail ‘just works’ 99.9% of the time, and I no longer have to think about deliverability. All wins in my book.”

Collin Simmons

System Operations Manager, HostPapa

Ship Native Email
Without Inheriting the Risk

One compromised sender shouldn’t be able to suspend your account or damage every other customer’s deliverability. Build email into your platform on infrastructure that was designed for many senders from day one.

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