knowledge discovery in corporate emails

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Hey, I am final year engg. student. My project is "Knowledge discovery in corporate email".

I will have two computers (gmail user and server) in internet network resembling corporate network.
I am using postfix mail server on second computer.

It has 3 steps:
1. intercept employee email
2. Perform processing on email body content at server using python.
3. If content is not revealing any company secrets, forward it to gmail server.
4. If found guilty, raise alert on server and do not forward email.

Please, let me know how to do following:
* postfix server listen to other computer in network
* is any certificate required to forward message to gmail smtp server. If yes, Is it free and how to obtain certificate.

Posted 7-Sep-11 6:09am

sssandy patel

Updated 7-Sep-11 10:00am

Yvan Rodrigues

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#realJSOP 7-Sep-11 12:21pm

DO NOT include your email address in messages or questions.

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Yvan Rodrigues · Answer 1 · 2011-09-07T10:12:00

In this scenario I assume the Postfix machine represents the corporate SMTP server. If so, it doesn't need to "listen to other computers on the network" in that sense. It already listens on the typical SMTP ports (25, 587, 465, etc depending on configuration).

What you need to look into is how to create a milter (mail-filter). Milters are inherited from Sendmail, since Postfix was designed to be compatible with Sendmail. See Sendmail/Postfix Milters in Python[.^]

No, you should be able to send mail to gmail without a server certificate. See How to use Gmail as your SMTP server.[^]. Using certificates between mail servers is good practice, but it will cost you ~USD50-150.