Never tried it, but if you want to write a script, you can write something in VBA.
Also, you might can just create a rule to do it, no code necessary. So instead of using the auto-reply tool from the File button (backstage), you'll just create a new rule.
I would think it would work. Maybe this would be the process - or something close:
1. Create a Draft of the email that is to go out, saying "Thanks for your email."
2. Create a rule that fires whenever an email is received
3. Tell the rule to look at all emails (not sure if you need to enter a filter for this, or whether you can just skip it).
4. Trigger the rule to send an email to the message sender's address.
If you can't do it with a rule, you could still setup the draft email (or store the string values in code that you want included), and create a VBA procedure to handle it. The logic would be the same, except it'll be in code instead of text boxes and drop-downs. Also, if it's code, you could also add in some custom filters perhaps to not send it to spammers in case you get any SPAM email. But to do that, you probably would have to define that heavily or else rely on black and/or white lists within Outlook.
Anyway, that's just a stab at it. I'd like to take the time to test around with it, but I know I do not have time to seriously dig into it.
See what you can come up with, and post back with your progress and/or specific questions.
"But thanks be to God, which giveth us the victory through our Lord Jesus Christ." 1 Corinthians 15:57