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 The Mailbox server role hosts two additional services: Get-Service | Where Display Name -like "*Transport*" | Select Display Name Display Name ----------- Microsoft Exchange Frontend Transport Microsoft Exchange Mailbox Transport Delivery Microsoft Exchange Mailbox Transport Submission Microsoft Exchange Transport Microsoft Exchange Transport Log Search 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).
The other services listen on a variety of other ports (for example TCP 2525 for the Transport service).
Highlight the connector and click the “pencil” icon to edit its settings. In the Exchange Management Shell run the following command, substituting the name of your receive connector.
There are generally two specific business requirements: In this article I will demonstrate how to meet both of those requirements in Exchange Server 2013.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).Although the default Frontend Transport receive connector allows internal SMTP relay it will not allow external SMTP relay.For the remote network settings, click the – icon to remove the default IP address range.Then click the icon and add at least one IP address of an application server or device that requires external SMTP relay access. Next we need to configure some additional settings for the receive connector. The final step involves granting anonymous users (such as the unauthenticated SMTP connections coming from applications and devices on your network) the ability to send to external recipients.