Can the null address be specified in a ruleset?

[John Rudd]

Be careful, you're required by RFC (I forget which one) to treat <> as 
a valid address (it essentially means 
"MAILER-DAEMON at the.originating.host", and the reason yours is being 
inserted is probably that your MTA is qualifying and canocializing and 
such).  I don't know if the RFC-Ignorant RBL has a case for people who 
reject <> or not, but it wouldn't surprise me.

You might try mimedefang (a milter).  It gives you lots of 
functionality you can use to reject or discard (quietly) messages at 
different stages of the transaction.  You need to know perl, though 
(you basically have to write the handling code for each stage).


On Apr 18, 2006, at 2:32 PM, Jim Holland wrote:

> Hi Julian
>
> I have a user who is receiving numerous erroneous bounces of "cleaned"
> viruses from a large local ISP.  The viruses are spoofing her address.
> The envelope sender address according to the log file is the null 
> address
> <>, although when received by the user it has the envelope address
> MAILER-DAEMON at mango.zw that is added by our own system (mango.zw) after
> receipt.  I have tried the following in spam.blacklist.rules:
>
> 	From:   <> and To: user at mango.zw          yes
> and
> 	From:   MAILER-DAEMON at mango.zw and To: user at mango.zw          yes
>
> but, not surprisingly, neither of these work.  Can you suggest any way 
> to
> make such a rule work?  Or would it need to be a new feature?  I do 
> think
> it would be very useful to be able to use <> if it cannot be done at 
> the
> moment.
>
> I am not using SpamAssassin (don't have enough horsepower) so cannot 
> use
> that.  And I don't want to block other mail from the major local ISP 
> that
> is sending this junk.
>
> For the moment I will just try getting them on the phone once more . . 
> .
>
> Regards
>
> Jim Holland
> System Administrator
> MANGO - Zimbabwe's non-profit e-mail service
>
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