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<p>Hi Johannes,</p>
<p>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.</p>
<p>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.
</p>
<p>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?<br>
</p>
<p>Best,</p>
<p>Lennart</p>
<div class="moz-cite-prefix">On 08-12-2021 09:16, Johannes Ranke
wrote:<br>
</div>
<blockquote type="cite" cite="mid:3028235.j6zufalCTO@ryz">
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<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">...</p>
<br>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">>
This leaves me wondering if the Sender: should not be set to my
primary e-</p>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">>
mail, and if yes, how I could achieve this.</p>
<br>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">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.</p>
<br>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">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.</p>
<br>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">Johannes</p>
<br>
<br>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">[1]
<a
href="https://stackoverflow.com/questions/4367358/whats-the-difference-between-sender-from-and-return-path"
moz-do-not-send="true">https://stackoverflow.com/questions/4367358/whats-the-difference-between-sender-from-and-return-path</a>�</p>
<p
style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">[2]
<a
href="https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.2"
moz-do-not-send="true">https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.2</a>�</p>
<br>
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