![]() In the Exchange Admin Center navigate to Mail Flow -> Receive Connectors. To permit specific applications and devices to relay to external recipients we need to configure a new receive connector. ![]() 220 Microsoft ESMTP MAIL Service ready at Tue, 8 Oct Here is an example of what happens if I use Telnet to try and send an email to an address that is external to the organization. Adding a DNS alias for Exchange 2013 SMTP relayĪllowing External SMTP Relay via the Frontend Transport ServiceĪlthough the default Frontend Transport receive connector allows internal SMTP relay it will not allow external SMTP relay. ![]() You can just use the name of an Exchange 2013 server that is installed with the Client Access server role, or you can set up a more generic host record in DNS for them to use (which I recommend, as this makes it easier to migrate the service in future). This means that the only additional (and optional) step for making internal SMTP relay available to your applications and devices is to provide a DNS name for them to connect to. 220 Microsoft ESMTP MAIL Service ready at Mon, 7 OctĢ50 Hello The Client Access server role is configured with a receive connector called “Default Frontend SERVERNAME” that is intended to be the internet-facing receive connector, so is already set up to receive SMTP connections from unauthenticated sources and allow them to send email to internal recipients. Allowing Internal SMTP Relay via the Frontend Transport Service So whether you’ve deployed multi-role or CAS-only servers we’ll only be referring to the Client Access server role from now. The other services listen on a variety of other ports (for example TCP 2525 for the Transport service).įor both internal and external SMTP relay scenarios the Frontend Transport service will be handling the connections. No matter whether the server is multi-role or only installed with the Client Access server role, the Frontend Transport service is the only service already listening on TCP port 25 (SMTP). PS C:\> Get-Service | Where DisplayName -like "*Transport*" | Select DisplayName On a Client Access server there is only one service. Microsoft Exchange Mailbox Transport Submission Microsoft Exchange Mailbox Transport Delivery On a multi-role server this adds up to four services (Transport Log Search is not relevant to mail flow): PS C:\> Get-Service | Where DisplayName -like "*Transport*" | Select DisplayName This is actually two separate services, Mailbox Transport Submission and Mailbox Transport Delivery. Mailbox Transport service – passes email messages between the Transport service and the mailbox database.Transport service – performs email routing within the organization, and between the Front End transport service and the Mailbox Transport service.The Mailbox server role hosts two additional services: The Client Access server role hosts the Frontend Transport service, which provides filtering of email traffic (eg antispam agents), and routing of email between the internal Exchange servers and the outside world Looking at the Exchange 2013 transport architecture there are multiple services involved. How Does Exchange 2013 Know Which Receive Connector to Use?įrontend Transport vs Transport vs Mailbox Transport.Allowing External SMTP Relay via the Frontend Transport Service.Allowing Internal SMTP Relay via the Frontend Transport Service.Frontend Transport vs Transport vs Mailbox Transport.
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