src/Extensions/ContentReviewDefaultSettings.php
public function getReviewFrom()
    {
        $from = $this->owner->getField('ReviewFrom');
        if ($from) {
            return $from;
        }

        // Fall back to admin email
        return Config::inst()->get(Email::class, 'admin_email');
    }
public function getReviewFrom()
    {
        $from = $this->owner->getField('ReviewFrom');
        if ($from) {
            return $from;
        }

        // Fall back to admin email
        return Config::inst()->get(Email::class, 'admin_email');
    }
Get the "from" field for review emails.

@return string