If you decide to change your MX record to point to %BRAND_EXCHANGE_ONLINE_SHORT% Online in %BRAND_OFFICE_365_SHORT%. All ...

If you decide to change your MX record to point to %BRAND_EXCHANGE_ONLINE_SHORT% Online in %BRAND_OFFICE_365_SHORT%. All sent messages sent are routed through the %BRAND_EXCHANGE_ONLINE_SHORT% Online, or more specifically the %BRAND_EXCHANGE_ONLINE_SHORT% Online Protection (EOP) service that provides spam filtering. A message addressed to a user in your on-premises organization is routed first through EOP and then delivered to the user. This routing is recommended if you need a spam-filtering solution for your entire organization. It is also recommended if you have more users with mailboxes in %BRAND_EXCHANGE_ONLINE_SHORT% Online than on-premises.