Allow mail enabled Public Folders in o365 to accept mail from external domains
So you are in a hybrid environment and moved your Public Folders to o365 but suddenly 3rd party people can no longer send you emails?
Yeah… try this:
# For all Public Folders Get-PublicFolder -Recurse | Add-PublicFolderClientPermission -User Anonymous -AccessRights CreateItems # For a specific Public Folder Get-PublicFolder -identity "\Folder" | Add-PublicFolderClientPermission -User Anonymous -AccessRights CreateItems