Mail Problem.

[reg at dwf.com]

Im at a loss here.
I have 5 machines, 4 of them (should be) forwarding any mail generated by 
scripts to the 5th.
Its not happening.

When I go to the mail machine, my main machine, I can do

        telnet localhost 25

and it connects.  When I do the same command on the other 4 machines, it can 
not connect.
Now Im using my own sendmail.mc nad submit.mc, but have made multiple changes 
with
no effect.

WHAT controls the connection to localhost?

And just for completeness, NO there is no firewall running on the machines in 
question.

Any help would be appreciated.