>Hi....., everyone. Suppose we wanted to implement a system that allow our client to obtain our catalog (info) by sending their email. Once our system has received the email, it will auto reply with attached file.
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>Best regards
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>Kusnardi

You could setup a simple application that watches a POP3 Account for messages. When it receives a message, it generates your catalog message and adds the from address)from the incoming message) to the TO address(of the outgoing message) and easily ships out the response email.

This can easily be accomplished with only a few hours of work.