All incoming Outlook email blocked

I am not receiving email from senders using Outlook.

I tried using another email to send to my comcast and got the following error when using Outlook. I tried using gmail and the message went through.

It appears that the system is rejecting everything from Outlook as spam. What is going on there?

resimta-h2p-562548.sys.comcast.net rejected your message to the following email addresses:

[Edited: "Personal Information"]
There's a problem with the recipient's mailbox. Please try resending the message. If the problem continues, please contact your email admin.

resimta-h2p-562548.sys.comcast.net gave this error:
Prohibited by policy

Diagnostic information for administrators:

Generating server: DM8PR09MB6341.namprd09.prod.outlook.com

[Edited: "Personal Information"]
resimta-h2p-562548.sys.comcast.net
Remote server returned '552 5.2.0 Prohibited by policy'