netDumbster is a .Net Fake SMTP Server clone of the popular Dumbster.
Edit By BS Editor: nDumbster is a simple fake SMTP based on the original Dumbster java sourcecode. It has been ported to C# to enable .Net developper to unit test applications that send email messages.

nDumbster support all standard SMTP commands but instead of delivering messages to the user, it stores then in memory so they can be tested later.

Compared to other testing strategies such as mock objects, nDumbster can be used to validate our system configuration up to the SMTP protocol. As it acts like a real SMTP server, it validate that you use correctly your mail sending component.

nDumbster provide means to fetch messages send by your programs, and to check any properties of these messages. you can free download netDumbster 1.0 now.