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www.spamhaus.org

When we send email from exchange2007 (dynamic IP address) to any where, we receiving following message from some domains, not all.

"xxxx-12.ssss.net #554 5.7.1 Service unavailable; Client host [86.98.51.142] blocked using zen.spamhaus.org; http://www.spamhaus.org/query/bl?ip=86.98.51.142 ##"

what are these site who are resposible for blocking ip, are they isp's or who is these site like
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imran786
Asked:
imran786
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3 Solutions
 
captainCommented:
Spamhaus.org is a database server which is used to compare IPs to listed known spam servers. This is a contributory  service where anyone that received spam or non for that matter can report a source as spam server. When enough evidence exists the source is listed.

Antispam filter use this DB as part of the defense strategy. it seems that your server IP has been included and therefor any doamin using spamhaus validation blocks mail from your domain as a result.

This can happen if a spammer has used your server as a spam relay. You need to check your relay security and maybe invest in an AntiSpam software which will monitor who attempts to use your SMTP as relay

Look up http://www.spamhaus.org/faq/ for further info and on how to proceed next

hth
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imran786Author Commented:
Where Antispam filter reside, because we dont have any filter in server and no gateway. We have single exch2007 server with three important role.
How to get raid of this problem.
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captainCommented:
The AntiSpam Filter is the tool your recipients use, not you. It appears that your mail server has SMTP authentication disabled.

You will need remedy above then visit Spamhaus.org to get your IP removed, here is the link to the PBL, it has removal instructions as well, but you need to make sure you comply with the recommendations.

http://www.spamhaus.org/pbl/query/PBL145356

hth
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imran786Author Commented:
You mean to say if we enable SMTP authentication on exch 2007 server, problem can resovled.
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captainCommented:
It looks that way, apart from that you should anyway for risk of avoiding open relay...

See http://support.microsoft.com/kb/324958/en-us for more info

hth
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imran786Author Commented:
I checked thro~ telnet exchangeIP 25
Relay is not opened
"550 5.7.1 Unable to relay"
Now what is next thing to check
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captainCommented:
Hi

If you have worked through the above KB and confirmed that you match all the elements contained, you go to the link in my post 19554946 and confirm this to Spamhaus. This should then remove you from the black list

Hth
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captainCommented:
Hi

thanks for the points but I am confused about the C rating, did this not help you resolve the issue.

See http://www.experts-exchange.com/help.jsp#hi73

Regards
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imran786Author Commented:
Still i cant send the mail to some site.
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captainCommented:
I am sorry you cannot send to some sites but this may have nothing to do with this post. You need to consider that there is a reason for the black by spamhaus, if you had an exploit in the past then I would be blocking you from my server independently if I had been subject to the exploit attack. The only thing you can do is to contact the companies direct to clarify your issue.

It also may take time for the updated info to propagate on the mailservers as they may not sync their blacklist with spamhaus all the time, and there are other authorities that provide similar DBs to Spamhaus.

I am just confused why accepted the posts and rated as a C if it did not resolve your issue. All you achieve that way is that you may not get help from Experts if your ratings are considered unfair.

As far as I am concerned the advice was adequate to your problem, the fact that you will have to do some work to finalise this should not reflect on the quality of the answer.

Kind regards
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imran786Author Commented:
I got the idea from this post.
I will try resolve the issue. I think this may work.
Thanks for this post.
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imran786Author Commented:
ok
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imran786Author Commented:
A grade
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captainCommented:
Thanks for the points, if you have any issues further than this please come back and let us know.

Regards

Captainreiss
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