unwanted sender header via smtp submission [Was: Multiple Identities: Anonymity]

[Brady, Mike]

On 2014-03-26 13:24, Brady, Mike wrote:
> On 2014-03-26 12:50, Aeneas Jaißle wrote:
>> Am Dienstag, 25. März 2014, 15:34:23 schrieb hede:
>> 
>>> Hi,
>> 
>>> 
>> 
>>> It seems the MUAs add those headers. At least in my case.
>> 
>>> 
>> 
>>> I've added a line "/^Sender:/ IGNORE"
>> 
>>> to /etc/postfix/header_checks.submission and now the header has
>> vanished.
>> 
>>> 
>> 
>>> But that's not a solution, it's just a test. Because it will even
>> get
>> 
>>> removed if the header is desired and not set by accident...
>> 
>>> 
>> 
>>> Yet the question how to suppress this in roundcube and android
>> k9mail is
>> 
>>> still open.
>> 
>>> 
>> 
>>> regards
>> 
>>> hede
>> 
>> Did you take a look at "smtpd_sasl_authenticated_header" (maybe as an
>> option in /etc/postfix/master.cf)?
>> 
>> --
>> Yes that is on for the MSA, but that only covers what gets put in the 
>> Received header.  I set it to no to try it any way and there was no 
>> difference.
> 
> I just changed the Bynari connector to send through port 25
> unencrypted and unauthenticated and did a wireshark capture of the
> session.  In this case there is only one Sender header sent from the
> client and there isn't an additional Sender header added.
> 
> So either it is the MSA side of Postfix or the TLS/Authenticated code
> path in the Bynari Connector.  Still leaning towards the MSA myself,
> but having a tough time proving and figuring out why it is doing it.
> 
> Still looking.
> 

I turned TLS off on the submission service and got a wireshark capture 
of the session.  The email being sent out of Outlook/Bynari only has one 
sender header, so I am reasonably sure that it is something on the 
server doing this in my case.

Regards

Mike