Trouble validating mail, calendar and contacts servers

First off, I am brand new to working with servers, so bear with me!
I have a registered domain name, we'll call it mine.com. I have configured the hostname of my server to be server.mine.com
I am fiddling with hosting email, contacts and calendars, so I know I need to do some work with DNS records. I have setup an A record with Network Solutions to forward requests for server.mine.com on to my static IP address. First question is should I set the MX record with Network Solutions or in the DNS service on my Mac server?
Once that is figured out, do I need to setup separate A records for each service, or when I set up my clients can I point everything to server.mine.com and expect the client to know where to look?
I have been able to successfully host email only my synology NAS and thought I would try it on my Mac due to push notification support and I have been unsuccessful since changing platforms. I'm so mixed up know I can't even remember the successful config I had on my NAS.
I have read tons of blogs and posts, but I still can't figure this out, and when I think it's right, my clients can't even connect to the server.
TIA

I can help you with confusions you might find within the internal DNS set-up and external DNS set-up postings.
(I do need to overhaul those two articles for OS X Server 10.8 and its use of Server.app, but the basics are the same.  Just remember to hit the show-all-records button in Server.app, when you're working in DNS.)
I'll assume you have a NAT-capable gateway-firewall-router box at the edge of your network, and that you're not attempting to use OS X Server as a gateway-router-NAT for your internal network.
I generally prefer to have a separate domain name inside the network; either a subdomain of your registered domain, or a separate domain name registered and used only within your gateway firewall.
Your MX record is your mail exchange record, and that would be whichever SMTP server will be hosting your mail for your domain.
If you plan on hosting mail locally, then your ISP will have to set up the reverse DNS translation for your public DNS host name, or other mail servers can and variously will detect the mismatched DNS and will flag your mail server as a spam engine, and drop your outbound messages, and potentially drop messages intended for your mail server.
If you're "fiddling", remember that the DNS resolvers will cache the DNS server responses.  Put another way, if you fiddle with the DNS server, remember to flush the resolver cache on the clients before running your tests.   (Details on flushing the cache included in the replies to the internal DNS set-up postings.)
If you post your public domain name, somebody here can check your external DNS with a few commands.  If not, then launch Terminal.app and enter the commands for your domain example.com:
dig +short example.com MX
dig +short server.example.com
dig +short -x ip.address.returned.by.previous.command
server.example.com is the host name of the mail server returned by the MX query, and the IP address for the third command is the address returned by the second command.  The reverse translation (third command) should be the name you used in the second command.  To test how other DNS servers detect these same domain names, use Google DNS:
dig +short @8.8.8.8 example.com MX
dig +short @8.8.8.8 server.example.com
dig +short @8.8.8.8 -x ip.address.returned.by.previous.command
On your local DNS server on OS X Server, launch Terminal.app and issue the following (diagnostic, informational) command to verify local DNS is correct:
sudo changeip -checkhostname
FWIW, that "mine.com" domain is a real and registered domain.  If you want to obfuscate or document domains, use of example.com, example.org and example.net are reserved for this use by the RFCs.

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    E-mail address: [email protected]
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    Message Edited by laroma on 20-Dec-2009 08:58 PM

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