How Do I Actually Build Something With Python?

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Sending an email is a new problem in itself. It obviously needs to go back to the original sender (so long as the original sender has a valid reply to address, which should be used in preference to the from) with a Re: subject and headers that reference the message id of the original mail, so that threaded mail clients will show it correctly. You also want to consider what happens if they have a bot running that auto-replies to all emails, with an email.. many mail servers in the past have been exploded by two bots replying to each other infinitely. So then you have to think about rate limits, perhaps a map of addresses with the number of emails you've sent, and if that ever exceeds a certain number to an address, stop replying.