Spam filter keeps blocking legitimate email sender

I am using the Xfinity web client at https://connect.xfinity.com/appsuite

Thank you so much for clarifying that for us, @sac16! Do you have any other email filters setup aside from the attempts that you did to get the emails out of the spam folder? Can you confirm following steps here? If so, can you follow the steps here mark it as a good sender? Please let us know if that helps. 

Hi @XfinityAdrienne - I checked overnight to see if any other email has been filtered into the spam folder and can confirm that ONLY email from this particular sender is now being forwarded there.  I can confirm the following:

1. This sender is in my address book as a contact and the exact email address is listed
2. Yesterday, I had the setting to override the security filter to allow spam to go to my inbox.  Somehow this sender is still being forwarded there but NOT any other email (even legit spam).
3. I do not have any email filter rules currently setup

Something on the server/back-end is causing this sender to be sent to SPAM, even overriding the setting to allow spam.  When I try to move these messages to my inbox, they are IMMEDIATELY moved back into spam automatically.

Thank you for clarifying those details, @sac16. It is definitely unusual for messages you manually moved to the inbox to immediately go back to the spam folder. I don't think I've encountered that one before. Out of curiosity, are you able to send messages to this address without any issues, or do you get a bounce back if you try?

I don't think it accepts emails because it is only used to send alerts.  It's from my brokerage company - the address is [Edited: "Personal Information].  It is still doing it... I got another one 4 minutes ago and it went straight to spam even with the override rule enabled.