MailChannels

About MailChannels

MailChannels Email API sends transactional email as JSON over HTTPS for applications and platforms with multiple senders. Official JavaScript, Python and PHP SDKs help integrate sending and account operations. Domain Lockdown authorizes sending domains. Sub-accounts provide separate credentials, sending limits, suppressions, webhooks, usage reporting and suspension controls; sender IDs offer lighter reputation isolation. These controls help contain abusive traffic and protect legitimate senders. Delivery webhooks and operational data help applications track outcomes. An API acceptance response does not itself prove delivery.

MailChannels also supports SMTP sending through shared delivery infrastructure. Authentication, DKIM signing and available event feedback differ between SMTP and the HTTPS API. Follow the current documentation for credentials, domain setup, limits, operational controls and pricing.

Key features

• Per-tenant/sub-account sender isolation with scoped identity, rate limits, and reputation
• Webhook-driven suspension paths to rate-limit, pause, or cut off a single bad sender
• Bounce and complaint (FBL) webhooks for structured delivery event feedback
• Inline outbound threat filtering for phishing, malware, and abuse patterns
• Approval hooks to insert human or programmatic checkpoints before AI agent sends
• Both REST API and SMTP relay endpoints with the same isolation and controls

Frequently asked questions