How can I block emails with no sender?

Thanks again ku4hx. For me, an OS re-install is just too risky. For me, OS upgrades tend to cause problems. Of course a re-install is not an upgrade but nevertheless I am reluctant. I am also skeptical that an OS re-ionstall would help anything. If I was comfortable with OS-reinstalls I would probably just do it.

Another reason I don't want to try an OS re-install is because I belieive this problem (cant block "no sender" emails) is a known problem with Apple mail. The thread I referenced is at least a year old. But on that year-old thread there are no useful solutions provided by Apple Support. So I suspect this is a known bug and Apple Support just doesnt want to acknowledge it publicly. I can't think of any other reason why such a simple question would go unanswered for so long. I suppose another reason why the original thread has not been answered is because it's a bot answering with no human supervision.

Old Toad, I don't understand. Keyboard Maestro looks like a tool to create keyboard shortcuts. I get one "no sender" email every day. If I want to delete that email I make two clicks, one to select the email and the second click on the trash icon. So that's not many clicks to delete. I guess you could get it to one click with a custom keyboard shortcut, like shift-comand-alt-x-select or whatever. Are you suggesting my two click process could be improved to one click or are you suggesting something different?

My email supplier is also Spectrum. But when I look at my emails on webmail.spectrum.net I cannot see the emails from (no sender). (no sender) emails are only visible in the Apple Mail app on my desktop computer. LOL

FYI to all readers on this discussion thread: Someone, presumably an Apple agent, is curating this discussion thread.

I know this because since I started this discussion thread on August 19, 2023 (about three weeks ago) many messages have been deleted from this discussion thread and the non-deleted messages have been rearranged in what appears order of importance. So I conclude Apple is curating this thread.

Apple's curation of this thread appears to me to be a good idea as the key solutions to the problem are easier to locate.

However the curation does have the disadvantage that if you wanted to reply to a specific contributor you may not be able if that contributor's message was deleted. I am brand new to this forum. Perhaps there are message thread display options which are user selectable and I am simply unaware. Or not.

Apple's curation of this thread begs several questions. Maybe readers of this thread will know the answers? Certainly the curator/s could chime in with some useful info.

1) What happened to the "me too" button? When I first visited this thread today I saw a "me too" button with "43" displayed adjacent to the "me too" button. I concluded that 42 people besides me have this problem. But then I signed in and the "me too" button is nowhere to be found.

2) How many "me toos" are needed to raise the priority of this issue sufficiently high for Apple to fix the problem? For this (no sender) problem, seems likely the Mail App could be revised in less than sixty seconds.

I think pfsonline may have given us the solution. Creating the rule in the Apple Mail app took me less than one minute and I have never created an Apple Mail Rule before. I will update in a few days after I see if its working for me.

pfsonline's solution did not work for me because it moved ALL of my inbox messages to the trash. it took me 15 minutes to move them all back.

Seems to me that pfsonline's solution should have worked. I entered the intructions correctly in the Apple Mail rules dialog box, i think. "From" "does not contain" "." So I don't know what went wrong. It appears to me that the Apple Mail Rules are not working correctly for me in this instance? macOS Big Sur 11.6.5