[Dshield] smtp test for open relay

Mark Squire msquire at lagraphico.com
Mon Jun 23 14:11:33 GMT 2003


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.

> -----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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