Xfinity email not receiving password reset emails from other major companies

There are several companies whose password reset emails don't come through to my xfinity email. This has been going on for months. I know that these companies are sending the emails as I've spoken to them directly. I'm assuming xfinity's email server is performing ISP email blocking or filtering on a password management service that's widely used. However there's no way to speak to xfinity email directly to fix this issue.