All messages that comes into Office 365 ... via Office 365 ... is filtered for spam.
If you still have your MX pointed to an on-premises server - that's what is causing the added spam. From: [email protected] [mailto:[email protected]] On Behalf Of Daniel Carp Sent: Thursday, December 31, 2015 7:16 AM To: [email protected] Subject: [Exchange] O365 Public Folder Spam Filtering We have a mail enabled public folder that is a member of a public facing distribution group. Since our conversion to Office 365, it has been receiving a growing amount of spam. Is there any way to set up mail filtering for public folders or distribution groups? Thanks & Happy New Year! Best, Dan
