Using New Outlook on Windows for professional communication and productivity
Dear UKdeejay,
Thanks for using Microsoft products and posting in the forums!
From your description, I understand that you're having problems creating rules with your domain name.
It seems that you can only create rules using full email addresses and I understand your situation.
In fact, you can use Outlook's “keyword feature” for the purpose of creating rules for domains:
When you are using new Outlook, go to Settings>Mail>Rules, when creating a new rule, at the 'Add a condition' choose Keywords>Sender address includes. This allows you to enter just the domain name and then create rules for it! See below screenshot:
Feel free to share how it goes and let me know if you need further assistance!
Best regards,
Harris-MSFT |Microsoft Community support specialist