How to create a masked email system? - email

I would like to implement a system of email masking on my web site/server similar to those ones of some ads' websites.
Example scenario: mysite.com
1) Bob posts an ad with ID #1234
2) Alice is interested and she contacts him through the website control panel
3) Bob receives an email from a-1234#mysite.com to his email bob#bob.com
4) Bob answers to a-1234#mysite.com, my web server receive the email and forwards it to alice#alice.com
5) Alice receives the email to her email alice#alice.com from b-1234#mysite.com
6) Alice answers to b-1234#mysite.com, my web server receive the email and forwards it to bob#bob.com
7) ...and so on
How can do that?
Thank you

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