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Re: rfe: automagic open relay message refusal?
"Benjamin C.R. LaHaise" <email@example.com>
> Where connect and check involves opening an SMTP session to the remote
> server and verifying that it does not relay mail for anyone.
Have a look at this:
[arnt@disorder arnt]$ telnet bra.gulbrandsen.priv.no 25
Connected to bra.gulbrandsen.priv.no (126.96.36.199).
Escape character is '^]'.
220-bra.gulbrandsen.priv.no Zmailer 2.99.54 #1 ESMTP, no spam welcome
220 Local time in Augsburg, Germany is Thu, 14 Jun 2001 20:03:34 +0200.
250 bra.gulbrandsen.priv.no Hello disorder.primate.net
mail from: <firstname.lastname@example.org>
250 2.1.0 Sender syntax Ok
rcpt to: <email@example.com>
250 2.1.5 Recipient address syntax Ok; rcpt=<firstname.lastname@example.org>
354 Start mail input; end with <CRLF>.<CRLF>
250 2.6.0 message accepted; into freezer area
221 2.0.0 bra.gulbrandsen.priv.no Out
Connection closed by foreign host.
Spot the "freezer" mention. That message is thrown straight into
/var/spool/postoffice/freezer through the magic of Zmailer's smtp-policy
What would you do if I (= that server) sent you mail? Would you conclude
that, since I answer "250" to a lot of RCPT TO arguments, I'm is an open
relay, and reject my mail?
Would you wait to see if I actually do relay? What would you do if,
during your open-relay probe, _I_ started testing whether _your_ server is
an open relay?
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