The documentation would be provided with mail server software, if it has this functionality.
It is not how you are sending email (SMTP), but the mail server that handles your incoming mail for
your website that would need to have the auto-responder application. You have to contact the Admin
that handle the incoming mail server.
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Thomas A. Rowe
Microsoft MVP - FrontPage
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Agents Real Estate Listing Network
http://www.NReal.com
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