Sending, receiving, and organizing email in Outlook on the web for business
What you're describing is not related to the Unverified issue the person who created this post was talking about.
If you have an IT department, you may want to contact them.
Otherwise, you should probably create a separate post to see if anyone can shed light on what you're talking about.
I'm not aware of anything that would require forwarding of email to only forward emails from your safe senders.
I'd see if your IT department has implemented some sort of new policy that is causing this restriction.