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Paul is a Microsoft MVP for Office Servers and Services.

He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server.

The “Default Frontend” receive connector has remote network settings equivalent to “anything”.

220 E15MB1.exchange2013Microsoft ESMTP MAIL Service ready at Tue, 1000 helo 250 E15MB1.exchange2013Hello [192.168.0.181] mail from: [email protected] 2.1.0 Sender OK rcpt to: [email protected] 2.1.5 Recipient OK data 354 Start mail input; end with . 250 2.6.0 <[email protected]> [In ternal Id=20005957664769] Queued mail for delivery You may be wondering how the server knows which receive connector should handle the incoming SMTP connection, considering that both the “Default Frontend E15MB1” and “Relay E15MB1” connectors are listening on all IP addresses and on the same port (TCP 25).False False As with the internal relay example I recommend creating a DNS record for a generic name for SMTP.For most environments there is no need to create separate DNS names for internal vs external SMTP.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).A very common scenario for Exchange Server 2013 administrators is the need to allow applications and devices on the network to use the Exchange server as an SMTP service.There are generally two specific business requirements: In this article I will demonstrate how to meet both of those requirements in Exchange Server 2013.Update Star includes support for many languages such as English, German, French, Italian, Hungarian, Russian and many more.You can choose your language settings from within the program.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.

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