I asked this question before but kind of gave up. My SMTP server seems to be blacklisted on backscatter.org. Here is what it says on their site:
Testresult for 67.200.162.XXX
This IP IS CURRENTLY LISTED in our Database.
Please note that this listing does not mean you are a spammer, it means your mailsystem is either poorly configured or it is using abusive techniques.
If you don't know what BACKSCATTER or Sender Callouts are, click the links above to get clue how to stop that kind of abuse.
To track down what happened investigate your smtplogs near 08.09.2010 15:13 CEST +/-1 minute.
You will either find that your system tried to send bounces or autoresponders to claimed but in reality faked senders, or your system tried sender verify callouts against our members near that time.
So you should look for outgoing emails that have a NULL SENDER or POSTMASTER in MAIL FROM and which got rejected at remote systems.
Read the rejection texts carefully and it shouldn't be a big deal to figure out what caused or renewed your listing.
20.04.2009 13:26 CEST listed
03.10.2009 15:25 CEST expired
05.01.2010 01:05 CET listed
02.02.2010 01:25 CET expired
02.02.2010 04:59 CET listed
02.03.2010 05:25 CET expired
29.05.2010 11:25 CEST listed
26.06.2010 12:25 CEST expired
29.06.2010 17:51 CEST listed
A total of 11 Impacts were detected during this listing. Last was 08.09.2010 15:13 CEST +/- 1 minute.
Earliest date this IP can expire is 06.10.2010 15:13 CEST.
This IP is temporary listed.
The listing will expire automatically and free of charge 4 weeks after the last abuse is seen from that IP.
Expedited manual expressdelisting is available as an option, in case you do not want to wait for the automatic and free expiration.
You will be charged 101 USD using one of the following payment services.
WARNING: Before requesting expressdelisting make sure the problem which caused the listing is fixed, otherwise you are at risk to get listed again if new abuse becomes known.
Notice how the most recent problem was on 9-8-10. I have no idea what is causing this problem. I didn't know how to find my SMTP exchange logs, but looked it up and apparently it was logging nothing. So I turned them on with IIS setting enabled and set them to hourly. Please, someone make a suggestion to track down my problem. I am sure no one on our domain is spamming, and my wifi encryptions would take months to crack... Surely it's a simple problem?