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Where previously the server responded with “550 5.7.1 Unable to relay”, now an SMTP connection from the IP address 192.168.0.181 is allowed to relay successfully.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 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).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.
There are generally two specific business requirements: In this article I will demonstrate how to meet both of those requirements in Exchange Server 2013.
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.
220 E15MB1.exchange2013Microsoft ESMTP MAIL Service ready at Mon, 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 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.
But first, let’s cover some of the fundamental Exchange 2013 concepts that apply here.
Looking at the Exchange 2013 transport architecture there are multiple services involved.
Select the server that you wish to create the receive connector on. Exchange names the various default connectors using a standard of “Purpose SERVERNAME”, for example “Client Frontend E15MB1”. If the server you chose is multi-role you’ll need to select the Frontend Transport role.