RE: Relay Nightmare

  • From: "Craig_Weil" <craig_weil@xxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 27 Sep 2004 14:25:11 -0700

Well, if I look at one of the messages in the queue, it reads:

Message ID:
EXCHANGEPY4mplzmgvT0000a06a@xxxxxxxxxxxxxxxxxxxxx
Sent from: "Dorris Chea"antoinesauce@xxxxxx
Subject: EN|1|ARG|NG, STRENGTHENING AND DEVE|OP1NG
Priority: NOrmal
Message size (bytes): 802
Nuber of body recipients: Not Available
Number of envelope recipients: 1
Recipients:
 Envelope Recipients:
 SMTP:christine6468@xxxxxxxxxxxxxxxx;

Granted, there are many Delivery Status Notification (Failure) emails, but perhaps this is due to the fact that many spam messages are sent to addresses which don't exist and my server is letting the spammer know it wasn't deliverable... at least that's my take on it since the address in the NDR is the sender that originated the email.

Thanks again!

Craig



----- Original Message ----- From: "Steve Moffat" <steve@xxxxxxxxxx>
To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
Sent: Monday, September 27, 2004 2:13 PM
Subject: [exchangelist] RE: Relay Nightmare



http://www.MSExchange.org/

Are you sure they aren't spam NDR's??
S

-----Original Message-----
From: Craig Weil [mailto:craig_weil@xxxxxxxxxxx]
Sent: Monday, September 27, 2004 6:05 PM
To: [ExchangeList]
Subject: [exchangelist] RE: Relay Nightmare

http://www.MSExchange.org/

Thank you Steve,

Here are the results... seems to me that I'm not an open relay, but
there are many emails that are being queued, mostly undeliverable.
Again, traced the IP addresses of incoming and outgoing traffic and the
only IP address on my network that is being used is the server's.  It's
quite puzzling.

OK, connected to ##.###.###.###...
< 220 exchange.blahblah.org Microsoft ESMTP MAIL Service, Version:
5.0.2195.6713 ready at  Mon, 27 Sep 2004 13:59:51 -0700
HELO edit.dnsvr.com
< 250 exchange.blahblah.org Hello [69.72.176.182]
MAIL FROM:<cweil@xxxxxxxxxxxx>
< 250 2.1.0 cweil@xxxxxxxxxxxxxxxxxxxxxx OK
RCPT TO:<craig_weil@xxxxxxxxxxx>
< 550 5.7.1 Unable to relay for craig_weil@xxxxxxxxxxx





From: "Steve Moffat" <steve@xxxxxxxxxx>
Reply-To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
Subject: [exchangelist] RE: Relay Nightmare
Date: Mon, 27 Sep 2004 17:48:51 -0300

http://www.MSExchange.org/

That's not how you do it....you use you domain email address and see if

you can relay to other mail addresses.

Steve

-----Original Message-----
From: Craig Weil [mailto:craig_weil@xxxxxxxxxxx]
Sent: Monday, September 27, 2004 5:36 PM
To: [ExchangeList]
Subject: [exchangelist] RE: Relay Nightmare

http://www.MSExchange.org/



Hi Tom,

Here are the results, and thanks a ton for your assistance!

OK, connected to ##.###.###.###...
< 220 exchange.blahblah.org Microsoft ESMTP MAIL Service, Version:
5.0.2195.6713 ready at  Mon, 27 Sep 2004 13:32:00 -0700
>HELO edit.dnsvr.com
< 250 exchange.blahblah.org Hello [69.72.176.182]
>MAIL FROM:<craig_weil@xxxxxxxxxxx>
< 250 2.1.0 craig_weil@xxxxxxxxxxxxxxxxxxxxx OK
>RCPT TO:<it_mhz@xxxxxxxxxxx>
< 550 5.7.1 Unable to relay for it_mhz@xxxxxxxxxxx



>From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
>Reply-To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
>To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
>Subject: [exchangelist] RE: Relay Nightmare
>Date: Mon, 27 Sep 2004 13:18:14 -0500
>
>http://www.MSExchange.org/
>
>Hi Craig,
>
>Run this http://www.zoneedit.com/smtp.html
>
>And let us know what is says.
>
>HTH,
>Tom
>www.isaserver.org/shinder <http://www.isaserver.org/shinder>
>Get the book!
>Tom and Deb Shinder's Configuring ISA Server 2004
>http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7> MVP -- ISA
>Firewalls
>
> -----Original Message-----
> From: Craig_Weil [mailto:craig_weil@xxxxxxxxxxx]
> Sent: Monday, September 27, 2004 1:11 PM
> To: [ExchangeList]
> Subject: [exchangelist] RE: Relay Nightmare
>
>
> http://www.MSExchange.org/
>
> Hi there Tom,
>
> Yeah, that was one of my initial thoughts too.  I ran Ethereal
on the
>mail server and filtered by port 25.  The packets I captured would
>display the originating and destination email addresses and I then
>verified that they were being queued by using the Message Tracking
>portion of System Manager.  All IP addresses referenced in the
>packets were from outside sources.  It has me stumped!
>
> Craig
>
> ----- Original Message -----
> From: Thomas W Shinder <mailto:tshinder@xxxxxxxxxxx>
> To: [ExchangeList] <mailto:exchangelist@xxxxxxxxxxxxx>
> Sent: Saturday, September 25, 2004 9:54 PM
> Subject: [exchangelist] RE: Relay Nightmare
>
> http://www.MSExchange.org/
>
> Hi Craig,
>
> Do a NetMon trace and identify the source IP address of
the relayed
>spam. It could be that your users are infected with a spam generator
>and the spammer is leveraging their authenticated connections.
>
> HTH,
> Tom
> www.isaserver.org/shinder
><http://www.isaserver.org/shinder>
> Get the book!
> Tom and Deb Shinder's Configuring ISA Server 2004
> http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7>
> MVP -- ISA Firewalls
>
> -----Original Message-----
> From: Craig_Weil [mailto:craig_weil@xxxxxxxxxxx]
>
> Sent: Friday, September 24, 2004 2:02 PM
> To: [ExchangeList]
> Subject: [exchangelist] Relay Nightmare
>
>
> http://www.MSExchange.org/
>
> Running Exchange 2000, default settings for the
smtp virtual
>server... (Anonymous Access - so we can receive outside email, Basic
>Authentication, Integrated Windows Authentication all checked, Relay
>restrictions set to "Only the list below" which is empty and "Allow
>all

>computers which successfully authenticate to relay..."
>checked so that employees can send mail while connected to another
>ISP,

>Outbound Security options set as default - Anonymous Access checked)
> My server is STILL relaying mail.  I can look in
any number of
>queues and it's like a clearing house for spam.
>
> Any ideas?
>
> Much appreciation!
>
> Craig
>
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