A Clean lightweight Mail Server for Test [closed]

Question

I need a Mail Server to test an application that send and receive emails.

So it should:

• be lightweight and small in size
• be free (like free beer), open source preferred
• support Win XP
• support SMTP, IMAP (POP3 is optional)
• install clean

Plz:

• Don't suggest connecting to Gmail, its ports are blocked.
• Don't suggest testing frameworks.

Answer 1

How about hMailServer: http://www.hmailserver.com/

It includes SMTP, POP3, IMAP servers

Answer 2

I'm rather fond of Papercut. It only does SMTP, but it can run without administrator privileges.