incorrect “from” email displayed in subscriber’s post notification

When I publish a new post, my subscribers are sent an email notification c/o Jetpack. The email notification is correct in all details except the email account the email comes from. The email “from” field indicates an entirely different website of mine (a site I have with wordpress.com). I know all of my websites (self-hosted and wordpress.com sites) are “linked” via my wordpress.com login and jetpack. But how do I change the “from” field?

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