[imp] Re: spamassassin and blocking lists

[Alain Fauconnet]

On Wed, Nov 03, 2004 at 04:42:01PM +1100, Iain Pople wrote:
> Michael M Slusarz wrote:
> >Quoting Iain Pople <ip at brunny.com>:
> >
> >>Michael M Slusarz wrote:
> >>
> >>>
> >>>Search the archives for a discussion of this previously.  
> 
> i've searched but can't find much. any links would be useful.
> 
> >
> >Because you are not thinking of the problem in the correct way.  Received
> >headers are added at *every* server stop along the way. Thunderbird 
> >delivers as
> >follows:
> >Thunderbird client --> Mail server
> >One hop -- one header.
> >
> >IMP delivers as follows:
> >Web browser --> Web server --> Mail server
> >Two hops -- two headers.  This is our behavior.
> >
> 
> I don't think the number of hops (and headers) is particularly 
> important. The issue is that a header inserted from IMP triggers 
> spamassassin whereas a header inserted by the mail server doesn't.
> 
> E.g. The following header triggers spamassassin:
> 
> Received: from CPE-203-45-11-59.vic.bigpond.net.au 
> (CPE-203-45-11-59.vic.bigpond.net.au [203.45.11.59])
>     by webmail.brunny.com (IMP) with HTTP
>     for <iain at localhost>; Sun, 24 Oct 2004 10:21:07 +1000
> 
> This one doesn't:
> 
> Received: from cpe-203-45-11-59.vic.bigpond.net.au ([203.45.11.59]) by 
> bwmam09.bigpond.com(MAM REL_3_4_2a 138/139363271) with SMTP id 
> 139363271; Sun, 31 Oct 2004 14:35:01 +1000
> 
> Note, the sending IP address is the same in both cases.
> 
> I agree that the bug is most likely with spamassassin, but i'd like to 
> know why.

Don't Hotmail and Yahoo! Mail insert the same kind of headers (...with
HTTP...) showing the IP address of the client? I think they do.
In that case, do they trigger SA rules? If not, what's the  difference
with the header IMP inserts?

Greets,
_Alain_