V2.1 Emails - Where is the domain for from/reply to coming from?

Hi,
I have a site whose ‘root domain’ is A in website settings, and the website is also at A. However, in the v2.1 emails, the domain is B. I can’t find B anywhere in the website settings. Is it possibly stored somewhere that my masteradmin login doesn’t see? Or where is that located?

It’s based off the first email address in the ‘admin notification email’ list in the website settings.

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