smtp4dev - the fake SMTP email server for development and testing.
A dummy SMTP server for Windows, Linux, Mac OS-X (and maybe elsewhere where .NET Core is available). Lets you test your application without spamming your real customers and without needing to set up a complicated real email server with a special configuration. Messages received in smtp4dev can be viewed and inspected.
If you're looking for the older v2 Windows only GUI version. Grab it here.
If you find smtp4dev useful, please consider supporting further development by making a donation .
Configuring your programs to send mails to smtp4dev
