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exchange - New email domain - SMTP 550 5.7.1 Unable to relay

I have just added MX record for mail.example.com.
Previously there was MX record for example.com. we have default email address-domain
@example.com - and it is working fine for send and receive. we need to get some
admin-level email addresses working that ends with @mail.example.com, for
example:





  • webmaster@mail.example.com

  • postmaster@mail.example.com

  • admin@mail.example.com

  • administrator@mail.example.com



so
we added the MX record and pointing to same server. I tested sending email to
webmaster@mail.example.com and postmaster@mail.example.com from inside domain and I am
able to receive emails to them. but from outside, I am not able to send email to those
address. it says






Message not delivered
Your message couldn't be delivered to
webmaster@mail.example.com because the remote server is misconfigured. See technical
details below for more information.



The
response from the remote server was:



550 5.7.1
Unable to relay




now, i see there
are some suggestion to create new receive connector in Exchange. we have Exchange server
2013. what parameters I need to use to create the new receive connector? we already have
default receive connector in both exchange servers for example.com and both inbound and
outbound emails are working fine.



we have two
exchange servers 2013, the servers are on cluster. each server has its own receive
connectors as
below.




Client Frontend
             - FrontendTransport
Client Proxy  -
            HubTransport
Default Frontend  -
            FrontendTransport
Default  -
            HubTransport
Internal-Relay  -
            FrontendTransport
Outbound Proxy Frontend  -
            FrontendTransport


any
suggestion will be greatly appreciated. thanks.

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