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Melanie here's the format I used in a Bridge workflow to push a body. No \ escape on the " marks. You may not need the [] array brackets or the extra object {}, that was a requirement for this particular workflow (Google Address Validation)

{"address": {"addressLines": ["{{runtime.data.cells.5049890497318788.value||}}"]}}

I would maybe try the following formatting for yours and see if it works? Also did you already run this through Postman and ensure that the API is just working in general?

{"email":"{{states.startstate.smartsheet.get_row.row.cells.Email.value||}}"}

I always put || in my references so that it doesn't error and stop the entire workflow if email happens to be blank on a row.

One other idea - on a POST you have to put a header in for Content-Type with a value of application/json. Otherwise most APIs won't recognize your body at all.

The "Unexpected character \\" error is, I think, coming because it sees the \" that you have and thinks it needs to escape the escape, so Bridge adds another \ to the mix, then the API doesn't understand what it's supposed to do with \\" in the body.

You can also try leveraging the Form Parameters instead of the body, sometimes I find that is easier to use and works. So you'd have a Form Parameter called email with a Value of {{states.startstate.smartsheet.get_row.row.cells.Email.value||}}