smtp4dev!

Mailtrap is a fake SMTP server for development teams to test, view and share emails sent from the development and staging environments without spamming real customers

FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily. It is written in Java.Configure your application to use "localhost" as your SMTP server, and all emails will be intercepted and displayed in this software.

Ever need to test emails from an application, but don't necessarily want it sending them out? Don't want to hassle with pointing it to a physical SMTP server? All you want to is verify it can send email, and take a look at the message.

Origami SMTP was created with the idea to have a fake email server for testing purposes that supported TLS. This is because the code the developer was working on at the time had several hard coded values enforcing TLS so most other solutions would not work. Those that appeared they might work often crashed when dealing with TLS.

LunaticSMTP is a dummy SMTP server with desktop GUI for testing email sending applications.

Mailosaur lets QA & Development Teams cover email as part of manual and automated testing.

A fake SMTP server for e-mail integration testing. We capture all the e-mails we receive and make them available via our website and REST API.

Own SMTP Server is a SMTP server for Windows that lets you send email messages directly from your system. It's very simple but very useful you can use it instead of ISP's SMTP server to increase your security and privacy. OwnSMTP Server supports all email programs lthe email program you already use for sending and receiving messages can be connected to the server in a very easy way by using "localhost" instead of your current SMTP host. Own SMTP Server is very fast, while sending, it establishes dozens of SMTP connections, and gets the most out of your Internet connection. The web interface of the program is very easy and a work in progress. The program is freeware forever so you can download it and try it if you desire! »