This has been running for a couple of years without any problems.
I need to recreate it with auto reply.
When a visitor fills up form & submit. In this case

-a email from the visitor to come to me on my email address with captured inputs of form filled.
-an auto email reply with pre-defined text should go from my email id to the email id filled up in form.
-secure form script using smtp authentication
-captcha or any other simple authentication to avoid spam hits

Employer have allocated budget for this project but you can increase or decrease bidding amount based on requirements.