[Dshield] smtp test for open relay

Mark Squire msquire at lagraphico.com
Mon Jun 23 14:32:54 GMT 2003


That's correct.  I was answering the wrong question.  My bad Fred/All.

> -----Original Message-----
> From: Tom Laermans [mailto:tom.laermans at powersource.cx] 
> Sent: Monday, June 23, 2003 7:23 AM
> To: General DShield Discussion List
> Subject: RE: [Dshield] smtp test for open relay
> 
> 
> At 16:11 23-06-2003, you wrote:
> >Uhm . . . No, sorry.  His advice was sound.  Another way is to use 
> >Netcat, but telnet <host> 25 works just fine if you want to 
> connect to 
> >smtp.
> 
> Uhm.. did you actually try telnetting to 23 to see what it 
> did? His advice was the same that was given a few times 
> before, but that doesn't 
> really help.
> Simple relaying can be tested with that, if you know the SMTP 
> protocol, but 
> if you check the tests ordb, mail-abuse, et al do, you'll see 
> there's way 
> more ways to relay through a seemingly-closed server sometimes.
> 
> telnet relay-test.mail-abuse.org
> 
> is the way to go. port 23.
> 
> Tom
> 
> 
> > > -----Original Message-----
> > > From: Fred Grayson [mailto:fred at fred-grayson.net]
> > > Sent: Monday, June 23, 2003 7:02 AM
> > > To: list at dshield.org
> > > Subject: [Dshield] smtp test for open relay
> > >
> > >
> > > Incorrect advice Joe. Connecting to the telnet port is the way it 
> > > works.
> > >
> > > >Try telnet relay-test.mail-abuse.org 25
> > > >
> > > >Without the 25 you'll be attempting a telnet session and 
> not a SMTP 
> > > >session. After connecting, you'll need to spoof an SMTP 
> transaction 
> > > >using the traditional helo, mail from: , and rcpt to: 
> followed by 
> > > >data
> > > then the
> > > >content.
> > > >
> > > >cheers
> > > >-Joe
> > > >
> > > >-----Original Message-----
> > > >From: Fred Grayson [mailto:fred at fred-grayson.net]
> > > >Sent: Monday, June 23, 2003 9:12 AM
> > > >To: list at dshield.org
> > > >Subject: [Dshield] smtp test for open relay
> > > >
> > > >
> > > >>Hi.
> > > >>
> > > >>Do you have links to ips web sites (or others) that 
> test for open 
> > > >>relays for an IP ?  I've got one to test and I don't know
> > > where to go.
> > > >
> > > >If you have access to the machine running the mail server
> > > itself, you
> > > >can test it. Just run this from a shell:
> > > >
> > > >telnet relay-test.mail-abuse.org
> > > >
> > > >
> > > >
> > >
> > >
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