Mailfox

Mailfox is a straightforward monitoring tool that keeps track of your transactional emails. It integrates with popular email service providers like Mailgun, SendGrid, and Postmark via webhooks. When an email fails to be delivered—whether it bounces, is marked as spam, or encounters a temporary failure—Mailfox sends you an immediate notification. This lets you know there's a problem the moment it happens, not days or weeks later.

The setup is designed to be simple and requires no coding. You just add the unique Mailfox webhook URL to your email provider's settings. A key aspect of its design is that it doesn't require API keys or access to your account; it simply listens for the event notifications sent by your provider. It supports an unlimited number of email events and can work with multiple providers at the same time.

This tool is most useful for developers, small business owners, and anyone whose operations depend on critical transactional emails like order confirmations, password resets, or booking notifications. If a failed email could lead to a missed sale, a frustrated customer, or a logistical headache, Mailfox provides an early warning system to help you fix the issue before it escalates.