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When authenticated SMTP is not an option you can create a new receive connector on the Exchange 2016 server that will allow anonymous SMTP relay from a specific list of IP addresses or IP ranges.
In the Exchange Admin Center navigate to mail flow and then receive connectors.
PS C:\> Send-Mail Message -Smtp Server mail.exchange2016-Credential $credential -From '[email protected]' -To '[email protected]' -Subject 'Test email' -Port 587 -Use Ssl In the above example the email is successfully received by the external recipient.
[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.True EXSERVER\Client Frontend EXSERVER True Minimal configuration is required to get this working.Assuming you've already configured an SSL certificate for Exchange Server 2016, and added a DNS alias for your SMTP devices and applications to use (I'm using a DNS alias of mail.exchange2016in this example), you should then also set the Tls Certificate Name for the receive connector.220 EXSERVER.exchange2016Microsoft ESMTP MAIL Service ready at Thu, 1000 helo 250 EXSERVER.exchange2016Hello [192.168.0.30] mail from: [email protected] 2.1.0 Sender OK rcpt to: [email protected] 5.7.54 SMTP; Unable to relay recipient in non-accepted domain An SMTP error code “550 5.7.54, Unable to relay recipient in non-accepted domain” is received instead.The receive connector will not allow an anonymous, unauthenticated sender to relay to external domain names, which prevents your server from being exploited as an open relay.
Get-Receive Connector Identity Bindings Enabled -------- -------- ------- EXSERVER\Default EXSERVER True EXSERVER\Client Proxy EXSERVER True EXSERVER\Default Frontend EXSERVER True EXSERVER\Outbound Proxy Frontend EXS...