RE: SMTP

From: Robert Lampkin [MSFT] (rlampkin_at_online.microsoft.com)
Date: 05/10/04 

Date: Mon, 10 May 2004 23:49:02 GMT

You guys are getting hit with RNDR spam. (Reverse NDR Spam)
This is about 75% of our call generator right now here at MS.
In E2k3 you can enable recipient filtering to prevent this. In earlier
versions you have to get third-party to assist with this.
Here is a link to an article that explains exactly what is happening too
you: http://www.cmsconnect.com/praetor/RNDR/prRNDR.htm
Here is the article for enabling "Recipient Filtering" :
http://support.microsoft.com/support/kb/articles/q823/8/66.asp
I hope this helps.

Robert Lampkin, MCSE: Messaging
Microsoft Exchange Support
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| Thread-Topic: SMTP
| thread-index: AcQ0c50NCk3NPmFjSYyBitJ6fvSA4g==
| X-WN-Post: microsoft.public.exchange.connectivity
| From: =?Utf-8?B?V2FkZSBLaXJraGFt?= <anonymous@discussions.microsoft.com>
| References: <a04b01c4346e$6b758f90$a501280a@phx.gbl>
| Subject: RE: SMTP
| Date: Fri, 7 May 2004 13:41:03 -0700
| Lines: 11
| Message-ID: <A4AECB1D-AB54-44DB-93BE-6EB208F65A29@microsoft.com>
| MIME-Version: 1.0
| Content-Type: text/plain;
| charset="Utf-8"
| Content-Transfer-Encoding: 7bit
| X-Newsreader: Microsoft CDO for Windows 2000
| Content-Class: urn:content-classes:message
| Importance: normal
| Priority: normal
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.0
| Newsgroups: microsoft.public.exchange.connectivity
| Path: cpmsftngxa10.phx.gbl
| Xref: cpmsftngxa10.phx.gbl microsoft.public.exchange.connectivity:95819
| NNTP-Posting-Host: tk2msftcmty1.phx.gbl 10.40.1.180
| X-Tomcat-NG: microsoft.public.exchange.connectivity
|
| Same thing here Marc, Most of my Clients with Exchange Server 2000/2003
queues are filling up with spam all of a sudden.
All my settings are correct
I've tested manually with Telnet - no relaying is allowed
I've ran a security scan with Retna and got no problems
I have firewalls in front of these servers with SMTP Command Filtering
enabled

Most all of the messages that are getting through are from sender
postmaster@mydomain.name

I filtered out postmaster@mydomain.com under sender filtering and checked
filtering box under SMTP Virtual Server, IP Addresses.

We'll see if it works.
|

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