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Microsoft outlook 2016 hygeine1/27/2024 ![]() All outbound email that's sent from my Exchange Online organization to the internet must also flow through the service. All email that's sent to my domain from the internet must first flow through a third-party archiving or auditing service before arriving in Exchange Online. I plan to use Exchange Online to host all my organization's mailboxes. Scenario 2 - MX record points to third-party solution without spam filtering Bypassing scanning on these IPs might allow spoofed and phishing messages from these IP addresses. Most third-party cloud anti-spam providers share IP addresses among many customers. Instead of bypassing spam filtering using a mail flow rule, we highly recommend that you enable Enhanced Filtering for Connector (also known as Skip Listing). Or New-InboundConnector -Name "Reject mail not routed through MX (third-party service name)" -ConnectorType Partner -SenderDomains * -RestrictDomainsToIPAddresses $true -SenderIpAddresses Any messages that are smart-host routed directly to Exchange Online will be rejected (because they didn't arrive over a connection using specified certificate or from the specified IP addresses).įor example: New-InboundConnector -Name "Reject mail not routed through MX (third-party service name)" -ConnectorType Partner -SenderDomains * -RestrictDomainsToCertificate $true -TlsSenderCertificateName *. -RequireTls $true Lock down your Exchange Online organization to only accept mail from your third-party service.Ĭreate and configure a Partner inbound connector using either TlsSenderCertificateName (preferred) or SenderIpAddresses parameters, then set the corresponding RestrictDomainsToCertificate or RestrictDomainsToIPAddresses parameters to $True. This value can vary from domain to domain, so check your value at Configuration > Domain > to confirm your actual value. In this example, the host name for the Microsoft 365 or Office 365 host should be .com. When you're configuring this scenario, the "host" that you need to configure to receive email from the third-party service is specified in the MX Record. ![]() You would only need to include the third-party service in your SPF record if your organization sends outbound internet email through the service (where the third-party service would be a source for email from your domain). SPF record: All mail sent from your domain to the internet originates in Microsoft 365 or Office 365, so your SPF record requires the standard value for Microsoft 365 or Office 365: v=spf1 include: -all Follow their guidelines for how to configure your MX record. ![]() MX record: Your domain's MX record must point to your third-party service provider. (Not sure how to do this? Follow the instructions on this page.) The following DNS records control mail flow: Update the DNS records for the domains that you added in step 1. To prove that you own the domains, follow the instructions in Add a domain to Microsoft 365.Ĭreate user mailboxes in Exchange Online or move all users' mailboxes to Microsoft 365 or Office 365. All email from the internet must first be filtered by this third-party cloud service before being routed to Microsoft 365 or Office 365.įor this scenario, your organization's mail flow setup looks like the following diagram:īest practices for using a third-party cloud filtering service with Microsoft 365 or Office 365Īdd your custom domains in Microsoft 365 or Office 365. My organization uses a third-party cloud service for spam, malware, and phish filtering. Failure to follow this will inevitably result in misclassification of inbound email to your organization and to subpar experience of Office 365 email and protection features. Microsoft strongly recommends you to enable Enhanced Filtering for Connectors or bypass filtering completely using a mail flow rule (check out point 5).
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