Forum Discussion
Public folder - (mail enable) reject mails from outside of organization
Hi, created public folder - set mail enable to it SMTP (primary): mailto:XXX@domainname.onmicrosoft.com SMTP: XXX@domainname set Public Folder permission (from my outlook 2013) anonymous cr...
That's the expected behavior, sort of. Exchange Online utilizes a feature called DBEB, which blocks messages sent to "unknown" recipients. This feature doesnt support cloud PFs, so any external email sent to them will be rejected. The workaround is to "disable" this feature by changing the domain to "Internal relay". Or sync PFs from on-premises. Details are here: https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-directory-based-edge-blocking