When you say, "they can telnet into our server" do you mean TELNET AND successfully use sendmail to fire out an e-mail? Or do you mean telnet to port 25 just work and you haven't typed any commands in?
for example :
telnet your.mailservers.ip.here:2
You login to Port 25 then type :
ehlo me@test.com (sometimes helo me@test.com)
mail from: youraddress@yourdomain.com
rcpt to: recipient@domainhere.com
data
[now type body of message. end with a period . on a line by itself]
Does that get sent?
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by: tommoranPosted on 2005-01-11 at 11:08:08ID: 13017077
http://support.microsoft.c om/default .aspx?scid =kb;en- us; q191687