how to Expose MS Exchange Server to the Internet

I have seput the exchange 2010 standard edtion in our small organization.Internally i am able to send and receive the emails.
Now i want to send and rceive the emails from internet.
I have googled about and know the MX records need to configure.
I don't know what id MX record , how to create and , how to configure, what are required steps need to be done at exchange server end to send/receive emails?

We didnt setup the Firewall/gateway? In future we have plan , If we setup Firewall/gateway in future what are the changes need , how we configure the mail to internet?

Give some explanation if possible with pics.

Thanks&Regards
Bunty
BuntyquestAsked:
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Simon Butler (Sembee)ConsultantCommented:
You must have a static IP address.
Then configure an A record to point to Exchange.
Then configure the MX record as the A record that you created.
This is in public DNS.

On the Exchange server, then only thing you have to change is enable anonymous on the Default receive connector. Forward port 25 to the Exchange server.
Configure a Send Connector in Exchange to send email.

That is about it. That should get email flowing if you have setup Exchange correctly.

Simon.
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Seth SimmonsSr. Systems AdministratorCommented:
you also need to open port 443 for outlook web app and autodiscover

http://technet.microsoft.com/en-us/library/bb201695%28v=exchg.141%29.aspx

on the public dns also configure SPF record and have your ISP add PTR record pointing to the public address being used for exchange (same value as your A record) to ensure remote servers don't start rejecting mail because it can't verify the sender

http://www.openspf.org/SPF_Record_Syntax

http://en.wikipedia.org/wiki/Sender_Policy_Framework
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