TELNET and SMTP

[wymerzp () sbu edu]

Hello all,
I'm looking at a client's site and they have unprotected access to port 25 (i.e. I can telnet to it and issue 
commands). When I attempt to send an email I get this message '553 Relaying is not supported'. My question is two-fold: 
1)What could I do with the unprotected SMTP access if I can't send mail. 2)What purpose do you believe that the SMTP 
service provides? Does the SMTP simply recieve!?!? Thank you all, Zach

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