![Kevin Beaumont on Twitter: "@0xDUDE @_MG_ Oh it's not a joke, it's also actively used by threat actors, has been for years - add that header to your email filtering and see Kevin Beaumont on Twitter: "@0xDUDE @_MG_ Oh it's not a joke, it's also actively used by threat actors, has been for years - add that header to your email filtering and see](https://pbs.twimg.com/media/FG3AIKgVEAIAI30.jpg)
Kevin Beaumont on Twitter: "@0xDUDE @_MG_ Oh it's not a joke, it's also actively used by threat actors, has been for years - add that header to your email filtering and see
![Spam email and Office 365 environment - connection and content filtering in EOP - Microsoft Tech Community Spam email and Office 365 environment - connection and content filtering in EOP - Microsoft Tech Community](https://techcommunity.microsoft.com/legacyfs/online/media/TNBlogsFS/prod.evol.blogs.technet.com/CommunityServer.Blogs.Components.WeblogFiles/00/00/00/31/06/metablogapi/image_60C3C2EE.png)
Spam email and Office 365 environment - connection and content filtering in EOP - Microsoft Tech Community
Enterprise Spam and Virus Filter with Exchange Online Protection | Information Technology | University of Pittsburgh
![Spam email and Office 365 environment - connection and content filtering in EOP - Microsoft Tech Community Spam email and Office 365 environment - connection and content filtering in EOP - Microsoft Tech Community](https://techcommunity.microsoft.com/legacyfs/online/media/TNBlogsFS/prod.evol.blogs.technet.com/CommunityServer.Blogs.Components.WeblogFiles/00/00/00/31/06/metablogapi/image_1C80CAF1.png)