Free Email Services APIs

Cloud-based email delivery service, marketing campaigns, and transactional APIs

Transactional email API for sending, receiving, and tracking inbound emails

Email marketing campaigns, audience lists, and automation workflows

Amazon Simple Email Service: scalable, cost-effective outbound email delivery

Lightning-fast transactional email delivery with high inbox placement rates

Modern developer-first transactional email API with React Email component support

Send transactional emails directly from client-side JavaScript without backend servers

Find verified professional business email addresses by company domain

Disposable and temporary email detection REST API with generous free tiers for both anonymous and registered developers

Send, receive, search, and manage Gmail messages and inbox threads

Global programmable SMS text messaging, voice calling, and OTP verify

The FreeCustom.Email API allows users to instantly generate disposable email addresses without registration or ads. This service enables users to create inboxes for receiving emails, extracting OTPs, and managing messages efficiently.

GrabMail's Disposable Email API allows users to create temporary email addresses to receive messages without requiring sign-up or API keys on public domains. Messages are accessible via HTTP requests and are automatically deleted after five days.

This API validates email addresses through format checks, MX record lookup, SMTP probing, and catch-all detection. It is designed for AI agents to efficiently assess and filter out invalid email addresses before further processing, without the need for a user dashboard.

Generate millions of temp mail from boomlify

The Tempmail API provides users with disposable email addresses that can be used for temporary registrations or verifications. It allows users to manage their temporary inboxes, retrieve emails, and perform various email-related operations securely and anonymously.

Allows users to generate temporary email addresses for receiving emails anonymously. It helps in protecting user privacy while signing up for online services without exposing personal email accounts.

AGPL-3.0 open-source email privacy suite providing programmatic disposable email aliases, forwarding inboxes, end-to-end encrypted deliveries, CLI utilities, and remote MCP server support.