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MailCue lets you test your app's email features without sending real emails to real people. You spin up a full email server (a program that sends and receives email) in one Docker command (a single line of code that runs the tool in an isolated environment). It handles SMTP, IMAP, spam filtering, and email authentication so your tests match what happens in production.
This tool is best for small dev teams who build apps that send emails and need a safe way to test that without spamming real people. The big win is that you can run a full fake email server locally with one command, which saves you from accidental test emails hitting real inboxes. That said, this is a developer-only tool — if you don't have someone technical on your team who knows Docker, it won't be useful to you at all.
