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Search guides for sender-risk controls, domain authorization, delivery events, setup, troubleshooting, and billing.

Email API

Abuse-safe transactional email for platforms, multi-tenant apps, and AI agents — with per-sender isolation, reputation controls, and automated enforcement so one bad actor never affects your entire account.

Send your first email in minutes — create an API key, authorize your domain, and make your first API call. Turn delivered, hard-bounced, soft-bounced, complained, and unsubscribed events into sender-risk signals. Authorize sending domains so MailChannels can protect shared reputation. Choose the right send path for latency, throughput, event visibility, and operational control.

Outbound Filtering

A cloud-based filter for outbound email that blocks spam and abuse before it leaves your mail servers, protecting your sending reputation and deliverability.

Connect your mail server to MailChannels and start filtering outbound email in a few steps. Look up MailChannels bounce codes — ESA, CS, RBL, IRR, and more — and find out how to resolve each one. How to locate a blocked sender in Log Search, delist an ESA block, and report false positives. Add MailChannels to your domain's SPF record and configure Domain Lockdown to prevent spoofing.

Inbound Filtering

Inbound filtering for hosting providers — block spam, phishing, and malware before they reach hosted inboxes, enforce authentication standards, with self-service quarantine and per-domain controls that keep your support team out of the loop.

Provision your first domain, prepare your mail servers, and route inbound traffic through MailChannels. Allow or block specific senders, domains, and IP addresses across your entire network or per domain. Review quarantined messages, release false positives, and configure quarantine delivery schedules. Set up per-domain filtering preferences, user access, and quarantine settings as a domain administrator.