I have the exact same question, when a visitor submits the "Contact Form" the email is sent from "no-reply@squarespace.info" and the FROM NAME is "SQUARESPACE" , this is a big problem because it doesn't look professional and doesn't fit with the website's domain and branding and i had to explain to my client many times that "squarespace.info" is the website host email, one of them even blocked it thinking its spam!
i really hope there is a solution for this, for some of us this is a major issue !
anyone have a solution for this ? thanks