Re: filter by mailserver

If that is the problem you are trying to fight, then follow the link to the FAQ and read why it's bad to whitelist your own address or domain.

You could potentially configure your MTA to add some customized header to your outbound mail, and then set up a "headers" rule on your incoming filter. Configure the rule so that if it sees that special header to automatically accept the message. That way, any mail that appears to come from your own domain but is forged will not have the header, and you can simply throw that message away. There are several ways you can identify mail that comes from your own server.

You could simply write a headers rule that looks for "Received: from mail.myvest.com (dsl092-024-162.sfo1.dsl.speakeasy.net" and automatically accept it without challenge. But if the mail is locally delivered, you may never see that part. Instead, you would probably still see a header that look like "Received: from [192.168.0.202] (eeyore.corp.myvest.com [::ffff:192.168.0.202])" which is the source header before your mail even leaves your server.


----- Original Message ----
From: Julie S. Lin <[email protected]>
To: David Hoffman <[email protected]>
Cc: [email protected]
Sent: Monday, December 4, 2006 2:08:30 PM
Subject: Re: filter by mailserver


Hi

what yer saying is absolutely correct, hence my desire to filter by 
specifying a mail server
is this possible?  i'm hopping spammers can't easily forge outgoing 
server identity

David Hoffman wrote:

> If what you mean is that spam is getting through because the spammer 
> forges an address that is on your whitelist, then the simple answer is 
> don't put that address in your whitelist.
>  
> If you put your own address into your whitelist, or your own domain, 
> then any spammer can forge it, and it will go through.
>  
> See: 
> http://wiki.tmda.net/TmdaFaq#head-e81137818ea55d7e15d5822687715793af7062ea
>
>
>  
> ----- Original Message ----
> From: Julie S. Lin <[email protected]>
> To: [email protected]
> Sent: Monday, December 4, 2006 1:14:12 PM
> Subject: filter by mailserver
>
> Hi
>
> is there a way to filter by originating mailserver?
>
> the rule "from *@=domain.dom ok" still allows spam clever enough to
> forge the from field.
>
> i'd like to write the filter such that mail originating from
> "[email protected]" is OK.
>
> or have spammers figured out how to forge originating mail server
> identity too?
>
> J
>
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