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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