Hi,

On Sunday, 2019-09-29 09:55:54 +0200, Daniel Pocock wrote:

> d) but [email protected] is the address that is really subscribed
> e) [email protected] appears in the headers of messages they receive
> f) internally, posteo.de was swapping the addresses in the headers and
> not keeping any record of the original destination [email protected].

posteo.de does not "swap" addresses in headers. It adds a Delivered-To
header with the main [email protected] account address as that is what it
delivers to and all other addresses are just aliases of the main
addresses.

The original destination address is tracked in the Received headers, as
soon as the message enters the posteo.de system it is delivered to the
account's main address.

Received: from mx01.posteo.de ... for <[email protected]>
Received: from [...externalsystem...] ... by mx01.posteo.de ... for 
<[email protected]>


  Eike

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