How can I block emails with no sender?

Set up a rule "From", "does not contain", "@", "delete". Worked for me.

The "no Sender" email issue is NOT just experienced by a few people - it is ubiquitous. I get about 5 a day, plus every person I know also gets them. Please work on a solution that will block such emails.

I receive 50 of these per day and I am on a mac sierra and can only update to big sur. Seeing you cant fix it with big sur, I dont know how to get rid of this garbage. I will say this is only happening on emails that are on Roadrunner email. tampabay.rr.com in my case. Apple iCloud mail doe not receive it.

When you say only two people have this. No many millions have it on Roadrunner email addresses is what I was told and Charter or Spectrum doesnt care about it because email to them is their lowest priority. They have said they wished every email customer would get another provider and that is quoting them. Anyone have any success with blocking the no sender mail? Please respond .thanks

One of the suggestions worked! Set up a rule "From", "does not contain", "@". Worked for me!

I did this simple step a couple months ago, and have not received a single spam "no sender" since. Congrats!

I had the same issue of course as everyone else. I figured out how to create a rule that blocks these and sends them to the deleted file so you never see them. I would suggest you call Apple and tell them you want to create a rule to send these emails to the trash or deleted folder so you never receive them again. They have things in common and you must write the rule to block the things they all have in common. I had to play with it a while to come up with the right definition for the rule but it works every time and the problem is gone. I can post the actual rule here, but I would rather recommend that you call Apple instead and let them tell you how to set it up. It is very logical, but it took me weeks to figure out how to do it. Don't lose hope if you have this issue. It can be resolved very easily once you think about it.

Good luck, Charlie

Have you tried setting up a rule inside Mail that moves a message to a folder that you designate if the sender DOES NOT contain a period character . or DOES NOT contain the @ symbol? The senders that are legitimate seem to all be in the form of xxx@yyy.zzz so a sender identified only as (no sender) would be flagged as not having a period (.) or not having an @ symbol (@) and would be sent to that spam folder. After determining that the rule works as you want, you could send those messages to the Trash instead of a folder.

Thanks. I just did this, except instead of using "delete" I "redirected" the #$%!email to reportphishing@apwg.org

I hope that works, I get a half dozen per day claiming to be expired payment methods for Amazon Prime or Charter.

While it should not be possible, it seems that some nefarious person has figured out a way to send an email without a sender. I've been getting 1 or 2 a day and looking at the raw headers, they seem to originate from Outlook/Exchange (see attached). I think that I've hidden my email address in the red boxes. What bothers me is that in order to "junk" the email, one has to click on it. I wouldn't be at all surprised that there is code embedded in the message body that sends back to sender, "Yay! We got another one! Keep them coming." One cannot set up a mail rule to move these to junk automatically because one needs to put something in the "From" box.

Who is your email provider? If Spectrum, a very good response can be found at: https://community.spectrum.net/discussion/172729/how-do-you-stop-spam-with-no-sender. Scroll down to "kpbr1600 September 2023". Here's his(?) reply:

"Go to the Spectrum email page at webmail.spectrum.net. Under

Settings, add an email filter to block any Sender that does not include

the @ symbol. It’s been working great for me!"

Spectrum also advises switching to a secure web based email provider.

Some thing I have tried, and seems to have worked is create a rule that states from does not contain . And just create a filter folder for anything to go to this way, you can easily double check and see if it works. It does not seem to delete any of my emails. It was suggested to create a rule that just had an.@ but that filters every email

Thank you for sharing the valuable "All Headers" tool. After receiving an intimidating "No Sender" email purporting to represent Malwarebytes, I checked Malwarebytes support. Here's their very helpful response: https://support.malwarebytes.com/hc/en-us/articles/360039025733-Advice-on-phishing-email-scams

I then used the "All Headers" tool to obtain the email source and submitted it to the suggested email analyzer and reported it to the FTC: https://reportfraud.ftc.gov/#/. The origin of the "No Sender" email was pinpointed to a computer in Des Moines, IA. If there are other government agencies and/or other organizations who can help to fight this abuse, please share them.