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RVS4000 and SBS 2008 SP2 Port 25 problem

My client has an Small Business Server 2008 SP2 with an RVS4000 router.  I went into the Administration of the RVS4000 to open up the ports that SBS requires to be open:  25 (SMTP), 443 (RWW), and 987 (Sharepoint).  I also opened 23 (Telnet).  I went into Firewall, Single Port Forwarding, and enabled each of the above ports.  They now can receive emails from the outside but they cannot send them.  Every sent email fails.  When I test from the server:  "Telnet <URL-addr> 25", no matter what address I use I get "could not open connection to the host on port 25:  connect failed".  MS tech says the router is blocking port 25.  Is there somewhere else in the router administration that I should open ports?  It's really strange because incoming mail is fine and it uses port 25.  Why would outgoing be stopped on port 25?  Thanks for any advice.


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