troubleshooting Question

FQDN Change Question

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chad_morrisFlag for United States of America asked on
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This may seem like a silly question but I am new to Exchange for the most part so...  

It is my understanding that the FQDN can be changed in the Virtual SMTP Server Properties under the Advanced Delivery dialogue box.  I have the Exchange Server registered in external DNS as mail.domain.com.  We had someone set the server up for us as we did not posess the knowledge to do it ourselves at the time.  The problem is that the FQDN is set to our internal DNS settings.  (eg. ServerName.Domain.Local)

Now that more and more admin's are filtering mail by performing a reverse DNS lookup we are running into issues naturally.  My question is:

Will this cause a problem if I change the FQDN to the externally registered DNS name?  (eg. mail.domain.com)

Is this the correct way to fix this problem to begin with?

Thanks in advance for any response.
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