Exhange Server 2010 allow all recieve but restrict send to only 5 PCs

I have an exchange 2010 server that needs to accept any email but send out only ones that are coming from the 4 PCs within the domain.  Sounds easy and maybe it is but so far i can't make it happen.  Here is my problem and my constraints.

I am not an exchange admin, but the guy that i paid a lot of money to configure it, apparently is not one either.  He left the server in a configuration that allowed my exchange server to be an open relay.

I have a dynamic IP so i use no-ip.com to sync my IP so it appears static, and i use authSMTP to help my email not get on black lists.

What i need to do is Allow anonymous users inbound, not outbound. The server should accept emails inbound from any email address.  But the server needs authentication outbound.
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upalakshithaConnect With a Mentor Commented:
to receive mail from any where add * in accepted domains tab.
for smtp authantication go to this links you can have an idea
AxeTracksAuthor Commented:
i'll check it out and get back to you, thanks
AxeTracksAuthor Commented:
wow it turns out to be fairly complicated and i had to learn alot about exchange to do what i wanted.  you got me pointed in the right direction thanks
glad to hear your your mind, i believe it is better to provide info than giving direct answer. in other words you may feel proud about your self by hard working because it done by you...
thanks again
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