My Autoresponder is not smart

[artcoder]

I would like an email auto-responder to not auto-respond back to the same person twice.

I went to my webhost webmail and set an auto-responder. I tested it by sending an email to it. The auto-responders just blindly replies back with an auto-response irregardless of whether it had auto-responded back to that email or not.

Don't you think that is dangerous? Because if someone else sends me a mail with an auto responder turned on. And I have my auto-responder turned on. They would just auto-respond back and forth hundreds of time until the mail quota is reached or the server goes down. Isn't it?

How can I get a "smart" auto-responder that does not auto-respond to the same person twice?

[SSANZ]

You can get smart responders...

What type/autoresponder are you using at the moment?

Your server webmail autoresponder or your PC email client?

[artcoder]

I want an auto-responder to can be installed on my shared webhost. Since my PC will be turned off, I don't need on that is client-side based.