how can I block spam from 'appspot.com'

your strategy of adding a nuisance domain to safe senders, then create a rule that deletes all the emails from the nuisance domain. The caveat is that you have to add everything past the @ sign into the safe domain list!! App spot always has some numbers/characters right after the @ sign!!! The good news, if you can call it that, is that apps pot has a limited group of characters after the @ sign... I have only personally seen about 10 or so unique sets of characters between the @ sihn and .appspot.com  Try try your strategy every time you get a new appspot domain after the @ sign. At one point, I was flooded with @dating-261239.appspot.com. (not sure of the actual numbers in the domain right now). I added that domain to safe senders, then a corresponding rule that deleted them when they got to my inbox...

I have used the same strategy for a few other nuisance junk mail domains...  dosoinfo.com, opensubscribe.club, dermaflage.com  etc...  and it has stopped the flow of junk clogging up my junk mail folder.

I'm getting over a 100 emails a day from domain "259323.appspot.com". Tried to setup a rule, but get an error message that the sender is not found.

I think you might be right if we start flooding them with phishing emails they might wake up thats going overboard with spam emails from appspot .

I think the ''appspot.com'' sites are governed by googles ad partners.

here are some of my findings.. 

hotmail-verified.appspot.com

hotmail-marketing.appspot.com

hotmail-dating.appspot.com

certificate-253617.appspot.com

Hi spartanSM,

I'm Tyler, an independent advisor trying to help.

As I understand it, you haven't blocked the domains of those spam emails right? If you don't, I would suggest doing so. That should help stopping the spam emails.

In the article below are steps on how to do so!

> https://www.lifewire.com/block-sender-outlook-1...

I hope this helps you.

Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

Best Regards,

Tyler.

I have this problem too, I will try the suggestions you stated.. I have tried to block the troublesome spam to no avail so your suggestion is welcome news..  thank you.