How can I block emails with no sender?

I can tell you that under ios17 and MacOS Sonoma, emails from “No Sender” continue to come through. In the last two weeks, I’ve been receiving a minimum of 20 such emails per day.

I can find no way to block these. I can’t add them to Junk because nothing identifying their source is available for blocking. I can only delete them day after day.

Please, Apple! Please add a filter to block “No Sender” and the next one they’ll try - “No Subject” emails. I’m quite fine accidentally missing out on something important that lacks either of these identifiers.

"No Sender" just started showing up in my emails. You can't right click and see the address. You cannot Block them. The only alternative is to Delete or Move to Junk and Delete. Do you have any recommendations to stop these?

I would suggest trying what I did create a rule that states sender does not contain, and just put a period, and then create a filter box for your mail to go into and check it for the first few days. Other rules that I have tried seem to have Taken every email I’ve gotten and filtered it. This one seems to have worked.

Hey, I tried this From does not contain "@" rule, and now all my recent emails (al l2024, in fact) have disappeared from my all mail mailbox! I went back and deleated the rule, but it's still all gone. Help!

After trying this, all my recent emails disappeared (going back at least 6 months). So I discontinued the Rule, and they have apparently fled to various Junk files. Whaaaaaa? Any idea how to retrieve these easily, and put them back in my In Box?

Here's what I did. It seems to be working. Set up an Apple Mail rule that sends all mail where "From" "does not contain" "." to trash.

You can check the full data for a boatload of information

Show detailed headers in Mail on Mac - Apple Support

Do 1.

Two users among the millions of those not having the condition, does not in any way indicate the existence of a defect in the OS.

However, you can tell Apple your concerns: Product Feedback - Apple

Tell Apple what new features added to the system via Feedback - macOS - Apple.  

Tell Apple what missing features you'd like restored or new features added to the system via Feedback - macOS - Apple.  

Is there any text in the body of the emails that you can use to create a rule to move them to the Trash mailbox?

Use to To: for your rule, not the From: :)

I occasionally get a no sender email but am able to delete it with a keystroke combination with Keyboard Maestro. I don't rely on a rule for that particular spam.