RE: TELNET and SMTP

["Shenk, Jerry A" <jshenk () decommunications com>]

A box with "unprotected access to port 25" is a mail server.  And, it
looks like it's configured to block relays....that's a good thing.  Set
up a mail server in your lab and experiment with it a bit.  Also look at
the SMTP RFCs to find out what the valid commands are.  This really
isn't a security problem (or at least nothing you've stated indicates
that) but learning how to manually send an e-mail message and test a
mail server is a valuable skill for any IT professional.

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of wymerzp () sbu edu
Sent: Saturday, July 07, 2007 8:31 AM
To: pen-test () securityfocus com
Subject: TELNET and SMTP

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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