oui depuis le serveur qui possede le smtp ( il chope l'ip par ce biais & on a tous les résultats )
genre chez moi  
 [mikala@andrea mikala]$ telnet relay-test.mail-abuse.org
 Trying 204.152.187.123...
 Connected to cygnus.mail-abuse.org (204.152.187.123).
 Escape character is '^]'.
 Connecting to 80.65.224.163 ...
 <<< 220 mikala.littleboboy.net ESMTP Postfix
 >>> HELO cygnus.mail-abuse.org
 <<< 250 mikala.littleboboy.net
 :Relay test: #Quote test
 >>> mail from: <spamtest@mikala.littleboboy.net>
 <<< 250 Ok
 >>> rcpt to: <"nobody@mail-abuse.org">
 <<< 554 <nobody@mail-abuse.org>: Relay access denied
 >>> rset
 <<< 250 Ok
 :Relay test: #Test 1
 >>> mail from: <nobody@mail-abuse.org>
 <<< 250 Ok
 >>> rcpt to: <nobody@mail-abuse.org>
 <<< 554 <nobody@mail-abuse.org>: Relay access denied
 >>> rset
 <<< 250 Ok
 :Relay test: #Test 2
 >>> mail from: <spamtest@maps1.pa.vix.com>
 <<< 250 Ok
 >>> rcpt to: <nobody@mail-abuse.org>
 <<< 554 <spamtest@maps1.pa.vix.com>: Sender address rejected: Domain not found
 >>> rset
 <<< 250 Ok
 :Relay test: #test 3
 >>> mail from: <spamtest@localhost>
 <<< 250 Ok
 >>> rcpt to: <nobody@mail-abuse.org>
 <<< 554 <nobody@mail-abuse.org>: Relay access denied
 >>> rset
 <<< 250 Ok
 [...]
 :Relay test: #test 19
 >>> mail from: <postmaster@mikala.littleboboy.net>
 <<< 250 Ok
 >>> rcpt to: <nobody@mail-abuse.org>
 <<< 554 <nobody@mail-abuse.org>: Relay access denied
 >>> rset
 <<< 421 Error: too many errors
 Connecting to 80.65.224.163 ...
 <<< 220 mikala.littleboboy.net ESMTP Postfix
 >>> HELO cygnus.mail-abuse.org
 <<< 250 mikala.littleboboy.net
 >>> QUIT
 <<< 221 Bye
 Tested host banner: 220 mikala.littleboboy.net ESMTP Postfix
 System appeared to reject relay attempts
 Connection closed by foreign host.
   | 
avec un message résumant la situation a la fin .
mais le nombre de tests varient parfois en fonction des réponses du smtp .