XFinity non-delivery report

Today 10/17/26 I received an XFinity non-delivery notice. It was for a recipe I found on the web that I liked and shared it to myself via email so that I could save it and make it. It did not involve a 3rd party...only Me sending to Me. So why does XFinity consider this spam? I don't find this to be helpful. I find it to be intrusive and annoying!