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1. To send mails to outside world you do not need an SMTP server but you need an MTA.
whereas to receive mails from outside world to your box, you need an SMTP server. There
are lots of free smtp servers
a) sendmail <- probably the best AFAIK
b) postfix
c) exim
d) qmail
... and lots more
2. For this you have to write scripts in CGI (perl/PHP/C++/C#/shell/...) or use custom made scripts like the ones which come with mediawiki etc., (mediawiki BTW is written in PHP)
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