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Blocking E-mails with no originator
- Thread starter fuego007
- Start date
From the looks of things, it seems like spammers are starting to use what's known as "Reverse NDR Spam Attacks"
You can try to stop this by:
1) use Exchange Message Filter and copy those addresses that <> is trying to send.
2) allow only known ips and hosts to email your exchange
3) Use 3rd party spam tool such as GFI or Xwall.
With that said, I still think the best way is to totally turn NDR off. But there seems to be no way of doing this in Exchange.
You can try to stop this by:
1) use Exchange Message Filter and copy those addresses that <> is trying to send.
2) allow only known ips and hosts to email your exchange
3) Use 3rd party spam tool such as GFI or Xwall.
With that said, I still think the best way is to totally turn NDR off. But there seems to be no way of doing this in Exchange.
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