I am looking to set up a system that will bring in an e-mail on a port like 4082 then sent it out to a standard e-mail port. this is a fire wall issue. I am looking for the best software I can use on an Ubuntu-Desktop platform to accomplish this and an idea on how to set this up?

I do not completely understand what you want to do. But whatever I understand, you need to redirect connections from one port to another. May be another system. What you need for redirection is iptables. This is default with every Linux distribution. So you need not install it. Just configure it to work your way.

Start here for iptables documentation.

I have an alarm system sitting behind a firewall, the IT is only allowing me one port which is 4082. The alarm system will send out an e-mail if there is a problem. My e-mail will not receive an e-mail coming to it on 4082 I need to set up a system that will receive a e-mail on 4082 and send it back out on a port a normal e-mail can receive.

By default no mail service will listen on the port that is open. If you are planning to put your own mail server, then you can configure it to listen on the port and then redirect the connections where you want.
But I still do not understand one thing, are you running your own mail server? And if you are not the administrator for your infrastructure, then you may not be able to do that either.

Also, how do you receive mails? And where is the mail server if you are not running one?

By what I am seeing and what you are saying I need to set up a mail server. I have been looking into Postfix. Is there another one that you can think of that would accomplish this. It would only receive e-mail from the security controller then forward it out to about five e-mail addresses.

I do not mean to say you obviously need a mail server. What I am asking how do you receive mails right now? Or you do not have a mailing system and you are planning to put one for yourself? If you already have a mailing system, and you have a mail server in place, even if that is managed by someone else, you can set the settings for the email address to forward the mails to another address.
Or am I still confused?

Another thing that you mentioned was postfix. That should be good choice. But if you want something else, sendmail is another one. I would say give as much information as possible about your network infrastructure so that we can understand what the situation is and what you are planning to do.
One more thing that would like to ask, when you say IT admin blocked all the ports except one, why did he/she do it? I do not see a point in blocking email ports? And even a www port is blocked?
That looks strange to me.

Hi,

You have in-house mail server or is it hosted somewhere else?

You cant post your mail server settings here; but let us know in short names :

Your SMTP Server name

Your POP or IMAP Server name

In short we want to know how you configure your mail clients(outlook or Thunderbird or kmail or evolution or any other?