Can't use spamassassin remotely

[Ted To]

My mail client doesn't seem to be able to get to my spamassassin
server.  When I "telnet <sa-host> 783" from the client, I get:
        Trying <sa-host>...
        telnet: Unable to connect to remote host: Connection refused
I can telnet to localhost 783 from localhost but not if I telnet to the
domain name from localhost, it gives me the above error.  I have
shorewall turned off.

Thanks in advance.