How to auo fill a line in a board from an email sent to the board

I am trying to configure the autofill of a table in a board.
When user fill out a form, it uses a formula to ask relevant questions, then it sends an email to a board. How can we autofil a table please from an email?
I have sent two emails to a board using the email address for
the board.
Both emails have gone to the board neither email has autofilled or auto
created a table.
How can you set up an email contents to autofill a table please ?
I would like the first email to create and configure the table.
Then other emails sent to the table to auto fill the same table.