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12/13/2006 at 10:17AM PST, ID: 22092216
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7.8

Secure exchange server 2003 from open relay

Asked by ictinus in Exchange Email Server

Tags: exchange, 2003, relay, server

I thought that I had configured everything correctly.  but.  

for my virtual smpt server under access > authentication - it's set to allow anonymous connections
then under access > relay - it's set to allow ONLY THE LIST BELOW with an empty list.  
the checkbox for allow all computer which successfully authenticate to relay is UNCHECKED.  

here are my problems.  

     yesterday I tried to fend off an NDR attack and cleaned out my queues.  however, the same people are still trying to get through.  I'm pretty sure that they can not relay but I turned on the logging for smtp and of course I get all these errors (one or two every second)  about whatever message can not be relayed...

and I'm still getting all this 'traffic' hitting my server which I would like to stop.

My goal is to be able to allow remote pop3 users to authenticate but not have an OPEN relay.  

one last thing... I tested a telnet session like this...

set localecho
open 192.xx.xx.xx 25 ( had to use local address... public address does not work )
got a response.  
ehlo hinet.net
         -- sender ok
mail from:dumb@hinet.net
         -- sender ok
mail to:dumb@hinet.net
         -- 503 5.5.2 sender already sent

if there is something I'm missing please let me know in the end I would like to have pop3 access and stop hinet.net.  

Thanks.
[+][-]12/13/06 10:20 AM, ID: 18132703

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About this solution

Zone: Exchange Email Server
Tags: exchange, 2003, relay, server
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Solution Provided By: redseatechnologies
Participating Experts: 4
Solution Grade: A
 
 
 
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