Sendgrid setup help

Having issues with getting started with Sendgrid.
What do I put in this block, domain? It does not except any / @ etc.

I am just in the process of creating an app and need a email capability. I am assuming the domain would be Bubble for now. Eventually I will use my own domain.
But goes here for the time-being? Cant get past this point.
Thank you.

Your domain should look something like

not or your Bubble app domain.

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