How to create mailbox on postfix?

I am new to postfix/Doecot. I want to create new mailbox when user type email on user interace . Like

------------------------------- UI -----------------------

Type email id you want to create __________________ [Domain.com]


On the frontend, I want an API to communicate postfix or Doecot etc. So, I will call that API in node.js , python.

And API will create mailbox on mail server.

After that I want another API to fetch received mail from mail server.

Thanks in advance

Using Virtualmin would be alot easier, otherwise where should be docs on the internet.
ie How to Install Postfix, Dovecot, and Roundcube on Ubuntu 20.04 | Vultr Docs

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