Exchange 2016 error 530 validating sender
When you send an email message that encounters a relay error, your SMTP (outgoing) email server might return your email message with an error message such as one of the following: The exact error message might vary, depending on your Internet service provider (ISP).Some ISPs might not return an error message when they detect outgoing messages as unsolicited commercial email.
You can change the authentication settings with the Exchange Management Console: To find receive connectors in the Exchange Management Console, navigate to Server Configuration - Hub Transport.I tried all the different ports, 25, 80, 3535 and 465 with SSL. Go Daddy’s stellar support referred her to Micro$oft.And of course they wanted to charge her for support on a brand new Dell Inspiron 15.The problem is caused by the default authentication settings of the Exchange (20) SMTP receive connector.By default the receive connector only allows authenticated transfers.We can find these configuration settings under Server Configuration, Hub Transport, Receive Connectors, Properties of the individual Receive Connector: Open the Permission Groups tab and check the Anonymous Users option to allow POPcon to connect to this receive connector.
This will allow email transfers from POPcon to Exchange without prior authentication again.
When you're away from home and send an email message using your home email account, your email message might be returned with a 550, 553, or relay-prohibited error message.
The same situation could occur when you're away from your office and try to send an email message using your work email account.
But that allows unauthenticated users to send emails.
On the other hand if i disable "Anonymous users", i am unable to receive emails from internet. Thanks I think your requirement is to only allow authenticated users to relay mail through your mail server.
I have recently deployed exchange server 2013, and I am new to this. Details: My Active directory and exchange server are remote on public IP and can be accessed VIA internet I want only authenticated users from my domains to be able to send emails.