Insights, tutorials, and updates about email testing, SMTP development, and the Mailloop platform.
An honest ranked comparison of 8 email testing tools in 2026: Mailloop, Mailtrap, Mailpit, smtp4dev, Mailosaur, Ethereal, MailSlurp, and the now-abandoned MailHog, with real prices and free tier limits.
Mailloop now has an MCP server and an Agent Skill, so your coding agent can create a sandbox, trigger a send, wait for the email, and assert on it from the chat.
Sandboxes can now push email events to your endpoint the moment they arrive.
We've released a public API and JavaScript SDK for Mailloop. Create sandboxes, fetch emails, and automate email testing directly from code.
We're launching Mailloop, an SMTP sandbox for testing emails during development. If you've used email testing tools before, you know what this is about.
