Forum Discussion
External emails via O365 to on-prem DL issues
Our MX are pointed to O365 about 2 weeks ago so far all looks good. However, today I noticed when an email from external mailto:send@xyz.com is sent to a DL which is on-prem exchange 2010. the on-p...
Check if the on-premises DL's are configured to receive unauthenticated email. Can you run this in PowerShell?
get-distributiongroup "name of group" | fl name,RequireSenderAuthenticationEnabled
If it is set to false try:
set-distributiongroup "name of group" -RequireSenderAuthenticationEnabled $true
get-distributiongroup "name of group" | fl name,RequireSenderAuthenticationEnabled
If it is set to false try:
set-distributiongroup "name of group" -RequireSenderAuthenticationEnabled $true