Email has failed to these recipients or groups

Just in the past few days my hourly emails from WD are going out but email I’m getting instead of the weather text is this. Any ideas where I should start to troubleshoot this?

Delivery has failed to these recipients or groups:

[email protected]
Your message couldn’t be delivered because you weren’t recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it’s no longer allowed to send messages outside of your organization. Contact your email admin for assistance.

this is not a WD problem as such
it looks like your email has been flagged as spam
not sure how you can get it off that
short of using a different email address (as sender/reply to) maybe