[RCU] change text of mail delivery report

[Benny Pedersen]

Gerardo Contreras skrev den 2022-10-05 16:57:
> The recipient of the original message? They do not get to see that
> there was a successful mail delivery report. It is generated by the
> system (and sent as MAILER-DAMEMON) to report that the system created
> a successful transaction with the recipient's mail system -- that is,
> that the message was properly dropped into the recipient's inbox. You
> might be thinking about the read receipt, which is (if approved by the
> recipient) sent by the recipient's mail system to notifiy that a
> message has been read.
> 
> The headers that I am talking about are the log of the transaction
> between both mail systems, as such, it is not necessary for the
> non-technical senders to read.
> 
> My apologies if I misconstrued your reply.

MAILER-DAMEMON is MTA only, this can sometimes be remote mta, but mostly 
its only your own MTA :=)

any other is not sure to get, since its always recipient that deside if 
sent or not