Setting up my own Exchange Server DNS and MX record help

So I have configured server 2012 with Exchange 2013 and have email functioning internally properly. Im having trouble with MX records and DNS records. The current is asking for DNS information. That would be my WAN address correct?
cnl83Asked:
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Simon Butler (Sembee)ConsultantCommented:
MX record is only a host name - it cannot be an IP address.
Therefore in your public DNS you need to create a host name - mail.example.com and then point it at your public IP address. Then create an MX record and point it at mail.example.com.

Exactly how you do it is impossible to answer as every host and DNS provider does it in slightly different ways.
http://exchange.sembee.info/network/dnsconfig.asp

Simon.
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