email replies are bounced back undelivered

[TexasPete]

I am using css tricks simple email form. I have it where it does send email to the email address I specify. However, when I reply to the email I am getting emails that are not able to be delivered. I know that some people enter false email addresses. What is a simply way to check to make sure I have not messed up the php. This is the first php I have used.
Yours Truly,
Texas Pete

[TheDoc]

1. Create a new email address at hotmail.

2. Submit a comment to yourself using your contact form with new email.

3. Reply to it.

That would be a simple check.

[Author]

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