Christian Brel wrote:

> On Wed, 24 Feb 2010 11:39:43 +0100
> "Rob Sterenborg" <r.sterenb...@netsourcing.nl> wrote:
> 
>> On 2010-02-24, Kai Schaetzl wrote:
>> 
>> > > Postfix:  I would have two different smtpd daemons - one for
>> 
>> > You don't have to run two postfixes for this.
>> 
>> I think Per means: 2 smtpd processes, not 2 Postfixes..
>> 
>> 
>> --
>> Rob
>> 
> 
> Humour me. Does this not mean a need to change the outbound to either
> a different IP or port? 

IP yes.  I assume your external and internal network are on different
IP-ranges. 

> I guess you could start hashing things around 
> with IPTables to redirect certain requests, but once you've done all
> of this, changed all the clients etc. etc, you are saying this would
> be *easier* than SPF?

See Mariusz Kruks suggestion - that's the way to do it.  Accept
everything from mynetworks, reject everything pretending to be coming
from your domain.  


/Per Jessen, Zürich


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