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Log off, close your web browser, and open the mailbox again in Outlook on the web.

In the page that opens, select Use the light version of Outlook on the web, and then click Save. ((mail-from != OR (rcpt-to != 'example\\. In the Search all settings box, type light and select Outlook on the web version in the results. If the office 365 servers are dynamic then you would need to add the required subnets along with the below message filter to prevent other domains from relaying emails through the ESA.

In order to allow emails from the Office 365 to be sent outbound you would need to add the office 365 IP to the HAT RELAYLIST under Mail Policies -> HAT Overview.Īdding this would then treat those emails as outbound and would process as per the outgoing mail policies including content filters and DLP. Email sent from Office 365 to external (internet) routes through on-prem ESA and normal content filter,outbound mail policy and DLP policy applies.