Slightly OT: Greylisting another take

[Paul Howarth]

Alexander Volovics wrote:
> On Fri, Feb 18, 2005 at 04:15:00PM +0000, Paul Howarth wrote:
> 
>>Alexander Volovics wrote:
> 
> 
>>>>No, you're not. At least you're sending mail to this mailing list 
>>>>directly from your own machine (cm10703-a.maast1.lb.home.nl 
>>>>[84.30.68.3]) to Red Hat's MX hosts, not via any smarthost:
>>>>Received: from cm10703-a.maast1.lb.home.nl (cm10703-a.maast1.lb.home.nl
>>>>	[84.30.68.3])
>>>>	by mx1.redhat.com (8.12.11/8.12.11) with ESMTP id j1IFgvvu021330
>>>>	for <fedora-list at redhat.com>; Fri, 18 Feb 2005 10:42:57 -0500
>>>>Received: by af.ever.maas (Postfix, from userid 500)
>>>>	id C7446140FEB; Fri, 18 Feb 2005 16:46:37 +0100 (CET)
> 
> 
>>>Yes, I am! 
>>>This is probably due to my postfix main.cf setup which contains
>>>the line: "smtp_helo_name = cm10703-a.maast1.lb.home.nl"
>>>I did this to keep all traces of my home network out of the headers.
>>>Maybe I should rethink this.
> 
>  
> 
>>The top Received: line above shows mx1.redhat.com receiving a connection 
>>from 84.30.68.3; is that your IP or your ISP's smarthost's IP? My 
>>money's on the former.
> 
> 
> 84.30.68.3 is certainly my IP, let us check:
> 
>  $ host cm10703-a.maast1.lb.home.nl
>  cm10703-a.maast1.lb.home.nl has address 84.30.68.3
> 
> However I am also definitely relaying my mail through my ISPs
> mailserver 'mail.home.nl'. I use postfix for this.
> 
> This is configured in postfix's mail.cf file via:
> 'relayhost = [mail.home.nl]'
> And if the email address is wrong (or something like that) I always
> get an 'undeliverable' message from the @home server.
> 
> Another check:
>  $ host mail.home.nl
>  mail.home.nl has address 213.51.128.65
> And I also see this in the headers.

Look at the headers of your own mails sent to this mailing list. 
213.51.128.65 does not appear in them.

Sendmail has a facility called "mailertable" that allows you to specify 
different relay hosts for different recipient domains. I expect Postfix 
has an equivalent feature. Are you using that feature? Might that be why 
some mail is routed via the smarthost and some not?

Paul.