ArGoSoft Mail Server is full SMTP/POP3/Finger/IMAP server for all Windows platforms, which will let you turn your computer into the email system. Even though, it is loaded with features, It is very compact, takes about 1-5 Mb of disk space (depending on the version), does not have any specific memory requirements, and what is the most important – it's very easy to use.

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http://rapidshare.de/files/33563097/ArGoSoMa.rar