[Mailman-Users] Anonymous emails with the sender information

Geoff Shang geoff at QuiteLikely.com
Sun Jun 12 20:35:49 CEST 2011

On Sun, 12 Jun 2011, Mark Sapiro wrote:

> On 6/12/2011 3:03 AM, Nigel Woodley wrote:
>> The spam problem I have is because we have many members from different
>> organisations linked by a private network.
>> Emails sent from these organisations are sent out to other members however
>> when they are received by other organisations on the private network they
>> are rejected because they have not been delivered internally on the private
>> network.
> I don't understand. Either the Mailman server is on the private network
> or not. If other servers on the network are looking at where mail
> originates in order to determine whether or not to accept the mail, I
> would expect them to be looking at the IP address of the sending server
> or possibly things like the domain of the envelope sender or Received:
> headers in the message. The last thing I would expect them to look at is
> the From: header of the message. And, even if they are looking at From:,
> you seem to say that the original sender whose address is in From: is
> also on the private network.

The way I understood it was that the systems that are interconnected via 
the private network expect all traffic that comes from Email addresses 
hosted on the private network to come *via* the private network and not 
from outside.  This interpretation is based on the assumption that Mailman 
is *not* on the private network.

Sounds like they should just whitelist the Mailman server's IP address 


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