REPOST:  I use WLM as my desktop client for email at Comcast.net. I am now switching my email accounts from Comcast.net to Outlook.com. During the transition I have set my outlook.com account to send and receive the email at Comcast so that I only have to log into Outlook.com to see both accounts.

I notice that any Comcast emails retrieved through the Outlook.com account have a yellow banner across the top saying Unknown Sender. I can either ignore it or pick Allow Sender. It does this for every email, even if from the same sender.

When I send an email from my Outlook.com email either to Comcast or Outlook email there is no banner on the received message, but there is a banner on the copy in the sent folder.

I do not see any banner when I use the web based Outlook, only WLM.

I have tried the mentioned repair option with no results.