By configuring Office 365 as described in Configure Outbound Mail Flow below, you instruct the Office 365 mail servers to pass all outgoing mail from your domain to the Barracuda Security Service (the gateway server). As the outbound gateway, the Barracuda Security Service processes the mail by filtering out spam and viruses before final delivery. You can also specify the Barracuda Security Service as the outbound mail gateway through which all mail is sent from your domain via your Office 365 account to the recipient. Use the Configure Inbound Mail Flow instructions below to configure. The Barracuda Security Service filters out spam and viruses, then passes the mail on to the Office 365 mail servers. You can specify the Barracuda Security Service as an inbound mail gateway through which all incoming mail for your domain is filtered before reaching your Office 365 account. Before getting started, contact Barracuda Technical Support and request that Outbound Groups be enabled on your Barracuda Security Service account.

Office 365 IP addresses and user interfaces can change refer to Microsoft documentation for configuration details. Use this article to prepare your Barracuda Security Service deployment to connect with Office 365. 1 How to Configure Office 365 for Inbound and Outbound Mail You can configure Microsoft Office 365 with the Barracuda Security Service as your inbound and/or outbound mail gateway.

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