I have a windows server 2003 with hmailserver running and configured, on that machine i can send/recieve mail… but when i try to setup from a lan client using outlook im cant reach the server. After reading through forums my question does my RB750G block ports 25/110 for internal ips?
By default there are no filters in the firewall, so all traffic flows. Additionally, if the mail server is on the same subnet as the clients that traffic doesn’t even go through the router.
Please describe your topology and configuration in greater detail.
Thank you for the quick response 
I have been placed in the role of IT admin, Im A+ certified and have no formal training in networking(studing for Network+) but 3 years of real world experience with networking…so enough to get me in trouble without guidence.
As per your answer my problem lies elsewhere but im sure as i get into my project further i may need some assistance.
The Topology is small office 10 workstations peer to peer on same subnet and wanting to migrate to server/client.
RB750G serves DHCP,Netgear 724 managed switch and adding 1 windows 2003R2 Server to handle email,file storage&backup,sharepoint serevices with future remote access.
once again thank you for your help.
No worries! Everyone starts somewhere.
In networks a topology description usually includes the IP addressing of the involved endpoints. What subnet are the clients on? Is the server on the same subnet? What is its IP address? How do the clients access the server? Is it - wild guess - via DNS name that resolves to a public IP address?
Right now I’m starting from the ground up reading and learning on the go,it is a simple class C private 192.168.1.X and everything including the server are in this range. I have set up an active directory and “something.local” as the domain on the server and only have a single test workstation connected to it, and havent registered to a public DNS yet.
I apologise as i have strayed from what was my original question, and greatly appreciate the assistance you offer and will seek your wisdom as i reach the level to which this forum is intended..if I’m able to get this level of assistance thoughout my project it will make this task more bearable
Kudos to the Guru who assist the noobs
Best way to test email servers (for me anyway) is telnet, but not the telnet in the router. It won’t take the port parameter.
Use a computer on the localnet with the email server. I’ll use 192.168.1.4 as the email server ip. Just an example. This is what the connection should look like from the remote computer. Notice the ‘25’ after the ip.
[tim@wifi03 ~]$ telnet 192.168.1.4 25
Trying 192.168.1.4…
Connected to 192.168.1.4 (192.168.1.4).
Escape character is ‘^]’.
220 email.yourdomain.com ESMTP x23si5036634yba.89
Type ‘quit’ to terminate the connection.
If it won’t connect, then it would be something in your server. Usually email servers require an ip entry in an ‘access’ or ‘relay’ list to send email. Server firewall maybe?
Followed your advice and used the “telnet”.. after snooping around and reading for a while found out that the servers firewall was shut off. So i enabled it and made exceptions for the hmailserver program- smtp port 25 and pop3 port 110 
Thank you very much for your help!!!
You are welcome! BTW, telnet will take a port parameter. I retried it on a V3.30 router, and it worked fine.
/system
telnet 192.168.1.4 25