Mail relay testing
Connecting to xlab-group.com for anonymous test ...

<<< 220-ns1.xlab-group.com ESMTP Exim 4.68 #1 Wed, 07 Nov 2007 20:29:13 +0200 
<<< 220-We do not authorize the use of this system to transport unsolicited, 
<<< 220 and/or bulk e-mail.
>>> HELO www.abuse.net
<<< 250 ns1.xlab-group.com Hello www.abuse.net [208.31.42.77]
Relay test 1
>>> RSET
<<< 250 Reset OK
>>> MAIL FROM:<spamtest@abuse.net>
<<< 250 OK
>>> RCPT TO:<securitytest@abuse.net>
<<< 550-Verification failed for <spamtest@abuse.net>
<<< 550-Called:   208.31.42.109
<<< 550-Sent:     RCPT TO:<spamtest@abuse.net>
<<< 550-Response: 553 Not our message (5.7.1)
<<< 550 Sender verify failed
Relay test 2
>>> RSET
<<< 250 Reset OK
>>> MAIL FROM:<spamtest>
<<< 501 <spamtest>: sender address must contain a domain
Relay test 3
>>> RSET
<<< 250 Reset OK
>>> MAIL FROM:<>
<<< 250 OK
>>> RCPT TO:<securitytest@abuse.net>
<<< 550-www.abuse.net [208.31.42.77] is currently not permitted to relay through
<<< 550-this server. Perhaps you have not logged into the pop/imap server in the
<<< 550-last 30 minutes or do not have SMTP Authentication turned on in your email
<<< 550 client.
Relay test 4
>>> RSET
<<< 250 Reset OK
>>> MAIL FROM:<spamtest@xlab-group.com>
<<< 250 OK
>>> RCPT TO:<securitytest@abuse.net>
<<< 550-www.abuse.net [208.31.42.77] is currently not permitted to relay through
<<< 550-this server. Perhaps you have not logged into the pop/imap server in the
<<< 550-last 30 minutes or do not have SMTP Authentication turned on in your email
<<< 550 client.
Relay test 5
>>> RSET
<<< 250 Reset OK
>>> MAIL FROM:<spamtest@[75.125.50.13]>
<<< 501 <spamtest@[75.125.50.13]>: domain literals not allowed
Relay test 6
>>> RSET
<<< 250 Reset OK
>>> MAIL FROM:<spamtest@xlab-group.com>
<<< 250 OK
>>> RCPT TO:<securitytest%abuse.net@xlab-group.com>
<<< 250 Accepted
Relay test result
Hmmn, at first glance, host appeared to accept a message for relay.

THIS MAY OR MAY NOT MEAN THAT IT'S AN OPEN RELAY.

Some systems appear to accept relay mail, but then reject messages internally rather than delivering them, but you cannot tell at this point whether the message will be relayed or not.

You cannot tell if it is really an open relay without sending a test message; this anonymous user test DID NOT send a test message.