Clean lightweight mail server for testing

Question

I need a mail server to test an application that sends and receives emails.

Therefore, he must:

• be light and small in size.
• be free (like free beer) preferred by open source
• Win XP support
• Support for SMTP, IMAP (POP3 is optional)
• set clean

Plz:

• It is not recommended to connect to Gmail, its ports are blocked.
• Do not offer test frames.

Answer 1

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

It includes SMTP, POP3, IMAP servers

Answer 2

I like Papercut . It works only with SMTP, but it can work without administrator rights.