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

[Johannes Ranke]

...

> 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 
[2] https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.2 
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