Some correspondents have kolab_user at kolab_server instead of From address in their replies

[Lennart]

Hi Johannes,

My hunch is that kolab.jrwb.de is set by Postfix as the envelope from 
(aka SMTP FROM aka Return-Path, as opposed to the From header in the 
message itself). The Sender header may be added either by Postfix or an 
intermediate SMTP server to indicate the original envelope from.

My envelope froms are also different from From headers and I'm not aware 
of any problems. My only advice would be to have the top domain part 
(i.e. jrwb.de) identical to the From header (to appease spam filters) 
and to make sure that SPF records are set for the envelope from domain. 
It's also important that emails to the envelope from address are 
deliverable, since it is where bounces are sent.

Hence, in deciding whether to use different envelope from addresses, I 
think your primary concerns are: (a) are the SPF records set up 
correctly for all domains that will be used as envelope from? (b) Where 
do you want bounce emails to be delivered to?

Best,

Lennart

On 08-12-2021 09:16, Johannes Ranke wrote:
>
> ...
>
>
> > This leaves me wondering if the Sender: should not be set to my 
> primary e-
>
> > mail, and if yes, how I could achieve this.
>
>
> I found some discussion on Stackoverflow on this [1], leading to RFC 
> 4021, updated by RFC 5322 [2]. All the RFCs which I looked up say that 
> a Sender: header should only be included if the author of the message 
> and the transmitter are not identical.
>
>
> So should I tell postfix not to include a Sender: address, and if yes, 
> how? I have no delegates specified in the kolab-webadmin, and none of 
> my users need this functionality.
>
>
> Johannes
>
>
>
> [1] 
> https://stackoverflow.com/questions/4367358/whats-the-difference-between-sender-from-and-return-path 
> <https://stackoverflow.com/questions/4367358/whats-the-difference-between-sender-from-and-return-path> 
>
>
> [2] https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.2 
> <https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.2>
>
>
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