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550 validating sender failed to meet spf requirements

This will allow you to configure all of your devices and applications with the DNS alias, and you can later move that DNS alias to point to a different Exchange server during a migration.Continuing from the previous demonstration, let's see what happens if I try to use Telnet to send an email message from a valid internal address to an external recipient.There are two ways you can resolve this and allow your devices and applications to send to external recipients: The first method is to use authenticated SMTP connections.Exchange Server 2016 has a receive connector designed to be used by clients that need to send via SMTP called “SERVERNAMEClient Frontend SERVERNAME”, for example “EXSERVERClient Frontend EXSERVER” in my test environment.In my test environment that IP address will now be allowed to send email from any email address (whether it is a valid internal address or not) to any external address.

[PS] C:\> Get-Exchange Certificate Thumbprint Services Subject ---------- -------- ------- FC5259C0528657EF22BB818CA9B23FD220A9DE83 ... CN=mail.exchange2016demo.com, OU=IT, O=Lock LAN Systems Pty Ltd,... First, capture some valid credentials to use for authentication.Select the server that you want to create the new receive connector on, and click the “ ” button to start the wizard. I like to keep the name consistent with the other default connectors.Set the Role to “Frontend Transport”, and the Type to “Custom”. This represents the IP and port that the server will be on for connections.This means creating the same relay connector on multiple servers and managing the same list of permitted IP addresses on those connectors.However, as you'll see by reading my article on issues with load balancing SMTP traffic, when a load balancer is source NATing the connections the only IP address that will appear to the Exchange server is that of the load balancer itself, not the source device or application.

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