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Backscatter / Unsoliciated Bounce Backs

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susheel View Drop Down
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    Posted: 19 July 2008 at 2:12am
Hello Roberto et all,

Am facing a issue with a backscatter emails to many of my domain names. SpamFilter ISP does not detect any spam in the email content and emails slip through to the respective email boxes.

I need to get rid of these. Please help !!

Susheel           
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jerbo128 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jerbo128 Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2008 at 1:45pm
Are you using the "authorized to" email list?  This will prevent mail to nonexistent addresses getting to your mail server.
 
jerbo128 
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susheel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote susheel Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2008 at 4:44pm
Hi,

What do you mean by "Authorized to" list? Can you please explain?

- Susheel
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jerbo128 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jerbo128 Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2008 at 8:07pm
By default, spamfilter will accept and relay "good" mail for all domains that are setup. 
It will accept mail for  XYZ@domain.com even if that address does not exist on the destination mail server.
Go to:  Settings - Configuration - Black/White Lists - White Lists - Authorized To Emails
This is a list of "valid email addresses".  Mail to addresses not in this list (if you have it turned on) will automatically be deemed spam.  This will help to prevent your backscatter problem.
 
Jerbo128
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susheel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote susheel Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2008 at 12:45am
hi jerbo,

I have so many domain names facing backstatter problems. Do i need to add all of the email addresses belonging to them? Also if i add email addresses out there will it mean emails addressed to other domain names apart from the listed ones will be rejected? Please clarify.. thanks in advance.

Susheel
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jerbo128 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jerbo128 Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2008 at 8:58am
Yes - It is an "all or none".  If you are going to use the list for 1 domain, you must use it for all.  You CAN use wildcards for domains that you wish - *@mydomain.com
 
I use this list myself, and it is VERY helpful.   I have our web interface setup so that "end user administrators" can add and removed the authorized addresses any time they add an account to their mailserver.
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Alan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alan Quote  Post ReplyReply Direct Link To This Post Posted: 31 July 2008 at 2:36pm
Susheel, you might want to look at this dns bl for some help with backscatter:

http://www.backscatterer.org/

They are a German group that some say are a bit too harsh, but may help you if you are having a lot of trouble.
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