Nestori Syynimaa shares a great deep-dive example of Azure AD Connect abuse. They are considered a tier-0 servers and should only be administrated by as few people as possible.ĭr. This is why an Azure AD Connect server should be secured with the same care as Domain Controllers. If a threat actor breaches the server hosting the Azure AD Connect application, the effects could be disastrous. This means the application has permissions to update identities in both on-premises AD and Azure Active Directory. A complete comparison of all features is available here.īecause Azure AD Connect is responsible for replicating identities between the two environments, it must have permissions in both environments. Cloud Sync is the newer variant of Azure AD Connect, but it does not have feature parity at the time of writing. The application used is either Azure AD Connect or Cloud Sync. Treating the Office as a Public Networkīoth on-premises and cloud environments are connected using an application to synchronize directory objects.

Microsoft have said they are working on improving the management experience with hybrid at Ignite last year, but that does not cover the need for SMTP relay scenarios like you describe. Given that you have an on-premises server, you would use that as your apps and devices SMTP relay device as well. With hybrid you need to maintain an on-premises Exchange Server for cloud mailbox management as you are doing AD Sync. ' that with hybrid you will never move away from this scenario. This is regardless what it says in the support article under Direct Send about it being for internal mailboxes only (see the other scenarios text where it talks about using Direct Send for mailing lists - which are external by their nature).Īs for #3, you realise when you say 'We will eventually move away from this and our internal mail server which is why we are not deploying new services that point to our internal mail server. This is why I did not suggest you try Option #1 and only either #2 or #3.įor either of these, it does not matter if the recipient is internal or external.

Therefore for #1 you would need to login with the actual From address and not another account, but then MFA would impact you. The error 'Diagnostic-Code: smtp 550 5.7.60 SMTP Client does not have permissions to send as this sender' means that the account you are logging in with does not have permission to send as the From address you are specifying. When I said that MFA has nothing to do with this, I mean this specific error.

365 mfa setup