Considering 99% of the websites/web applications has a part which send e-mails (like contact or sign-up pages), "testing if e-mails can be sent or not" is a frequent task.

Papercut is an open source simplified SMTP server, created specially for local testing purposes, that only receives messages & allows you to see the messages it receives.

Papercut - SMTP Testing Software

It can sit in the system tray & when a new message is received, a balloon message will show up to let you know.

Another good thing is, Papercut is very light & doesn't have an installer, just an .exe that works when clicked.

Optionally, it is possible to bind the application to a specific IP address or a port other than 25.

To sum up, the application is very handy for anyone who is testing e-mail sending functionality of their web applications locally & doesn't want to deal with any other setup or wait for the test e-mails to arrive.

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