Using On-Premises Exchange with Exchange Online Protection

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Thomas Young

New Member
Outlook version
Outlook 2013 64 bit
Email Account
Office 365 Exchange
A majority of my clients are running SBS 2011 and Exchange 2010. We've begun rolling out Microsoft Exchange Online Protection (EOP) to our clients because it's less of an administrative overhead for us and is an excellent SPAM and anti-virus solution.

I have found most of the documentation published by Microsoft (TechNet) for Configuring EOP, that includes but not limited to Best Practices, Anti-Spam Protection, data center IP addresses used by EOP, Configuring Content Filter Policies for Junk Email, etc. What I'm unable to find it anything that suggests, recommends or flat out says disable the on-premises anti-spam features from the hub transport. I opened a case with Office 365 to ask this question and they basically refused to advise me on how to configure Exchange 2010 citing it was out of their scope. They did said it was my choice whether or not I wanted to continue to leave those features enabled. However, I cited the fact that because I'm using it in a hybrid scenario that their support extends to local server configuration and that their documentation online clearly shows it's within their scope, e.g. http://technet.microsoft.com/en-us/library/jj837173.aspx. They simply would not listen and said I would need to pay to speak with the Exchange team. A very disappointing experience but not surprising for a company that used to have the best interests of SMB IT support companies in mind. Anyway, not to digress, my receive connector only receives email from EOP so I don't accept SMTP traffic directly to my client's public IP address and therefore wouldn't need the anti-spam enabled. Does anyone know of any published documentation that states the on-premises anti-spam features can safely be disabled once EOP has been implemented and is the only source of inbound mail delivery? I don't see any reason to leave it enabled simply because it seems to be redundant and it has caused some issues with false positives.

I thank everyone in advance for their advice.
 

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
I'm not aware of any documentation, but it makes no sense to me to leave it enabled if EOP is filtering. You can safely disable it - it won't affect Exchange capabilities.

I've had similarly bad experiences with Office 365 support - i think it depends on who gets your call.
 

Thomas Young

New Member
Outlook version
Outlook 2013 64 bit
Email Account
Office 365 Exchange
Thanks Diane! I disabled the anti-spam features and everything is running smoothly. I did open another case with Office 365 support and this time they were quick to assist and in the resolution email they said...:

"You can disable the spam setting on the Exchange server as the emails are already filtered by the EOP. If you want more aggressive filtering then you can enable the options."

...which is all I was wanting them to confirm in the first place. The feedback that I gave them is that this information should be published on TechNet, even if it was just a side note.
 
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