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gooberpea

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What is the Exchange Server's name

I have 1 box with Server 3003 and Exchange 2003, NOT SBS.  We use the exchange server for local internal mail and public folders.  I need our exchange server to handle external mail.  Currently we have our ISP doing our external mail.  We want our exchange server to handle this from now on.  Right now at DNS Stuff our MX record shows our ISP as our mail server.  I need to know how I can find out what our mail server is named.  All I can find is servername.company.local which I believe is what those directly connected to our local network see our exchange server.  I need to know what to tell the domain register to change the MX record to.  Where do I find this name, or is it something I dream up like mail.company.org and point the ip to our public ip address.
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myin68
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Your current mail server is probably something like mail.isp-provider.com.  First you'll have to register a new domain name for your company, unless you already have one.  Then your external DNS server will point the name you create (mail.your-company-domain.com) to a dedicated public IP that you own.  You tell your domain register to change the MX record for your new mail sever to your designated public IP address.  Your firewall will NAT that public IP to the Exchange private IP.
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jonnietexas

Hes right.  In English...The public IP address is the outside of your firewall, often the WAN address.  You will have to configure your firewall to forward in port 25 (SMTP) to your 2003 server.  
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Yes you are right, currently our mx record points to mail.isp-provider.com with their public ip address.  And I understand about creating a new mx record with our mail server name and our public ip address.  I just do not know what our public mail server name is or where to find it.  We registered a Domain name with netsol in 98 and our web site is hosted by upslide.  What would be our external DNS server?  Is it Netsol or Upslide, or did I create it on our own 2003 server?  Are you saying that one of these handles our DNS and they will have the name of our mail server?  How do I find out?  And once I find out who or what does our external DNS they will know what our public mail server name will be?
OK I think Upslide does our DNS.  I found a line at NeSol that says Designated DNS ns1.Upslide.com
You tell Upslide that you have a new mail server that's called "mail.your-company-domain.com" (that's ususally the name used for mail servers) and you tell them to point the MX record to your public IP address.  Your website is probably www.your-company-domain.com.  As jonnie mentioned above, don't forget to configure your firewall to forward in port 25 (SMTP) to your Exchange server.  
Yes that's what I thought it would be too is mail.company.org.  But the question is how do you find out?  I do not want to change the mx record until I have the correct info as I do not want to spend the next week or so not getting mail.   Is this name created by Exchange when you install it or is it a setting in Exchange.  Is it created when you register the domain name?  Or does the hosting comapny of our web site create it?  Where and When is this name created?  And which of the companys would i go to to find the name or create it?  Registered with NetSol, hosted by Illuminator, our own exchange server or does SPOCK keep them on board the Enterprise to Live Long and Prosper. :-)
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myin68
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This is the line that did it for me.  You get to makeup the name for your mail server.  You then tell the DNS company what IP address to point that mx record to.  Your internal DNS points the mx record to Exchange.
Thanks