Re: Open Relay Test

[D]

Thanks, Christoph..in order to automate this in a program (so the test
can be initiated from a system other than the mail server), I'm
thinking it could be automated (via pstools) to run on the system in
question.  I'll give it a try!

Cheers,

Doug

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Re: Open Relay Test

[Christoph Haas]

On Friday 17 February 2006 05:31, D wrote:
> Hi all .. how could one test to see if an open relay exists on a
> specific email server?

My simple favorite... run:

telnet relay-test.mail-abuse.org

from the mail server in question (and be patient).

Kindly
 Christoph
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Re: Open Relay Test

[D]

Thanks guys for the info..the DSBL client app is exactly what I
need..unfortunately the app I'm writing will be for Windows (the only
client I saw was for Linux). Do you know if there's a Windows command
line port?

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Re: Open Relay Test

[Ben Finney]

"D" <[EMAIL PROTECTED]> writes:
> Hi all .. how could one test to see if an open relay exists on a
> specific email server?

Use the Distributed Sender Blackhole List service:

http://dsbl.org/>

They have client programs to make it easy to use the service to test
mail systems for vulnerabilities:

http://dsbl.org/programs>

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Re: Open Relay Test

[D]

Nope, quite the contrary..I'm looking to write a simple program for a
client of mine that will, among other things, verify that their
clients' email servers do not have open relays.

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Re: Open Relay Test

[Steven D'Aprano]

On Fri, 17 Feb 2006 00:40:51 -0500, Steve Holden wrote:

> D wrote:
>> Hi all .. how could one test to see if an open relay exists on a
>> specific email server?
>> 
> I bet spammers would love someone to answer that question for them. You 
> wouldn't be planning spam, by any chance?

The spammers already know how to look for open relays. Unlike the original
poster, they know how to use Google. *wink*

Besides, not just spammers want to detect open relays. Many people like to
block mail from open relays.



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Re: Open Relay Test

[Martin P. Hellwig]

D wrote:
> Nope, quite the contrary..I'm looking to write a simple program for a
> client of mine that will, among other things, verify that their
> clients' email servers do not have open relays.
> 
I usually test it like this:

[EMAIL PROTECTED]:~> telnet mail.huygenslyceum.nl smtp
Trying 172.16.64.12...
Connected to mail.huygenslyceum.nl.
Escape character is '^]'.
220 mail.huygenslyceum.nl ESMTP Sendmail 8.12.11/8.12.11; Fri, 17 Feb 
2006 10:03:46 +0100 (CET)
~> helo 172.16.64.1
250 mail.huygenslyceum.nl Hello [172.16.64.1], pleased to meet you
~> mail from: [EMAIL PROTECTED]
250 2.1.0 [EMAIL PROTECTED] Sender ok
~> rcpt to: [EMAIL PROTECTED]
550 5.7.1 [EMAIL PROTECTED] Relaying denied. IP name lookup 
failed [172.16.64.1]

To get a more verbose explanation, google for smtp + telnet.

hth
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Re: Open Relay Test

[Steve Holden]

D wrote:
> Hi all .. how could one test to see if an open relay exists on a
> specific email server?
> 
I bet spammers would love someone to answer that question for them. You 
wouldn't be planning spam, by any chance?

regards
  Steve
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PyCon TX 2006  www.python.org/pycon/

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Open Relay Test

[D]

Hi all .. how could one test to see if an open relay exists on a
specific email server?

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