At first the No Subject duplicates (NSD) were from only one email address which is a Comcast email. Every one I received from this sender had a NSD.
Now it is happening from a variety of email addresses and more frequently.
It happens on xfinity.com website and on Xfiniy Connect app on iPad and iPhone and laptop. Using any browser, mostly Chrome. I do not use third party for email.
Is is there a way to stop this other than creating a rule to have the NSD email sent to a folder?