Xfinity is apparently blocking some legitimate e-mail from being sent to my Xfinity account.

I'm a former Trustee for my local school board.   In recent times, any e-mail sent to me from my local school's domain, bellevilleschools.org, is being blocked by Xfinity's servers.   I do not have any filters in place and this block is happening at the top level of Xfinity's e-mail system and not by me.   My local school board IT department has shown me the bounce-back/rejection notices they are receiving when anybody in their domain tries to e-mail me.   This problem has been happening apparently for the last several weeks.   And now I have to wonder how many other legitimate (non-spam) entities are also being blocked by Xfinity without my awareness or consent.  I've been an Xfinity customer from the inception of your company going back to the days even before Comcast was created.   I do expect your technical support to contact me asap to help resolve this problem.  Our school board's IT staff has told me that some of our students use bots in the effort to blacklist our district so that their teachers' e-mails also get blacklisted giving students plausible deniability in denying that they received homework assignments, etc. adding that this has now become nearly a daily problem forcing our IT department to notify all the major ISP's to whitelist bellevilleschools.org.   It would be very helpful to all the adults in our district if Xfinity would contact me directly so I can further discuss this potential problem as well as what Xfinity can do to help our school board's IT department have our districts TLD permanently whitelisted.  Ty.