Exchange Receive connector to relay emails from 3rd party internet services

Question

How we can create an Exchange Receive connector to relay emails from 3rd party internet services or do we need to do any other changes on Exchange? I just want to send an email from i.e. AWS application using on Prem exchange and email addresses. How it is possible. what configurations are required on the exchange server? Environment: 2 DC's2 Exchange servers 2013 CAS+Mailbox both are internet-facing servers.1 Edge server. I Created a relay on the mailbox server with authentication and without authentication but it is saying unable to relay. 

Answer 1

Hi @Muhammad Hussain ,

You could create an Open Relay to allow 3rd party send emails from your exchange server.

And make sure that allow anonymous relay only by the specified network hosts as identified by their IP addresses.

You could get more details from this link.
https://www.shudnow.io/2013/06/04/how-anonymous-relay-works-in-exchange-2013/

Please Note: Since the web sites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.

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Answer 2

Yes, we need to configure to send alerts from AWS applications using the in-house domain.

Is it possible without creating a relay?

As per your below statement kindly explain a little bit more, might be it can help us to configure.

If this is some alert email, then create an account and have the system authenticate on port 587 like a user