When emptying my iCloud mailbox I discovered that Apple appears to be filtering Mail. I read an article from 2013 that discusses this:
Is there any way to circumvent this intrusion?
Emails on the Cloud which haven’t D/L to my computer are prefaced with this partial message:
Clicking on it or moving it to another folder to open doesn’t complete the message so I don’t know what the problem with my email software could be, however the Article itself can be read but not downloaded.
As far as I can tell the blocked emails that are still on-line are all from The Shovel.
I’ve just discovered another awful truth about Mail. It appears that deleting messages from the cloud also deletes them from the computer mailbox.