smtp4dev

smtp4dev is small email server whose purpose is to help developers and testers view sent email messages via SMTP connections.

Simple looks

You can find the program sitting quietly in the system tray without interfering with your work. A double-click on the tray ion brings the main panel to your view.
The GUI looks clean and simple, focuses on providing quick access to the key features of the utility, and conceals several configuration settings under the hood.
You can check out details about each email message (e.g. subject, sender’s address), delete the selected email or all of them with a single click, save data to a file, as well as inspect or view the email messages. In addition, you can easily start or stop the listening process.

Configuration settings

You are allowed to run the utility at Windows startup and minimize it to the system tray, inspect messages instead of viewing them when you click on the popup notification, and specify the maximum number of messages to keep.
What’s more, you can set up alerts when a new message arrives, namely show popup notifications, automatically view and inspect the message, bring main window to the front, and scroll message list to show the new items.
smtp4dev includes support for several server settings that help you specify the domain name, pick the interface to listen to, enter the port number, allow SSL/TLS connections and authentication parameters, provide the SSL certificate, specify the maximum size of a message, and give the timeout (in milliseconds).

Bottom line

All things considered, smtp4dev comes to help developers who are currently testing or debugging software programs that generate email. It doesn’t take too much time to get used to it, thanks to its straightforward pack of features.