New Domain in the Exchange to use as alias in our existing accounts

the company has domain this is the one configure in our Exchange Server 2013 for emails and we will have a new company with domain , I need to use as an alias in for the same account we have now, How I can do that?

I need to add as a new Domain in the exchange and use the same MX record from  or I need to create a new MX record with new public IP
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Jose Gabriel Ortega CastroCEOCommented:
Step 1. Add the Domain to Accepted Domain.
        Go to Exchange Control Panel, navigate to  Mail flow/Accepted domain, click the + button.
       Add the name and the accepted domain: as authoritative.

step 2. Create A new Email Policy
       Go to ECP  Mail Flow/Email Address Policies, click the + button.
       In Name: Alias
      click the + again (email address format), select the format for the new email (usually is
      Apply to all recipients.

After that "APPLY" it.
And make sure that the connector includes the new domain if you aren't using the "*" in the send connector.

------- about the mailflow in public DNS, In the new public DNS.

MX record to the public IP of the server.

you have nothing to do with the current domain, so leave it alone

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timgreen7077Exchange EngineerCommented:
You will need to add domain as an authoritative domain on your exchange server. Then you will need to add this domain xyzcom to your default company email address policy as an additional alias. You dont need to create a new email address policy for it, just need to add it to your current default policy. If you want external users to be able to send emails to this domain, then you will need to create an external mx record for this domain to point to your exchange servers or whereever your mx record points to. That's all
Hasin Ahmed ChoudharyExchange AdministratorCommented:
Additional reference on understanding types of a domain:
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