The Natural Philosopher  writes:
> On 20/03/2020 10:19, Richard Kettlewell wrote:
>> Martin Gregorie  writes:
>>> Its well-known that the From: header is not used at all to transfer mail
>>> from sender to receiver - returned bounces are sent to the Reply-To
>>> address.
>>
>> No, they aren’t. Bounces are sent to the transport-level sender address
>> (often called the “return path”).
>>
> 'envelope from'

Yes, that too. Delivery agents often add it as a Return-Path: header as
their last act.

--
https://www.greenend.org.uk/rjk/

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