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Mail.cx review

Freemium#16 of 33 in Temporary Email Services

A practical receive-only inbox service with APIs, SSE delivery, and custom-domain support.

7.5/10Editor score
Visit Mail.cx
Mail.cx7.5 Visit Mail.cx

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Mail.cx is a web and API service for disposable inboxes, email testing, and receive-only email workflows. It suits individuals, developers, QA teams, product teams, and AI-agent integrations that need temporary addresses without signup. Messages arrive in real time through the browser, while inboxes and messages expire automatically. Custom local-part selection adds control over the address created for each workflow.

The Free plan provides a web inbox without signup, one-hour mail retention, real-time delivery, and REST API access. The Pro plan costs $4 per month and adds custom-domain support, seven-day retention for custom-domain email, real-time delivery, and REST API access. For automation, the API offers long-polling and SSE endpoints, and it can retrieve attachments. That combination makes Mail.cx a focused option for teams that need programmatic access to incoming messages rather than a conventional mailbox.

The main boundary is its receive-only design: teams needing outbound email workflows should choose another service. Free retention is also short, so longer-lived custom-domain workflows fit the Pro tier more closely. Mail.cx is a good choice when disposable inbox creation, browser-based SSE delivery, API access, and custom-domain receiving are the priorities. It is less suitable for users who need inbox protection, persistent general-purpose mailboxes, or two-way email communication.

Mail.cx pros and cons

  • Where it wins
    • Disposable inboxes work without signup
    • REST API includes long-polling, SSE, and attachment retrieval
    • Pro supports custom domains and seven-day retention
  • Where it doesn't
    • Receive-only workflows cannot send email
    • Free inboxes retain messages for one hour
    • No inbox protection is provided

Mail.cx fact sheet, pricing and score →

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