https://bugs.exim.org/show_bug.cgi?id=3071

--- Comment #3 from [email protected] ---
(In reply to Jeremy Harris from comment #2)
> The cutthrough facility uses the verify callout machinery (recipient, with
> the use_sender option) to place the ongoing connection.
> 
> Changing the envelope sender would be a breaking change.  I think supporting
> this will need an option on the ACL control=cutthrough_delivery -
> perhaps "/sender=transport", with "original" signifying the existing
> behaviour of using the received envelope-from?

Docs don't mention anything about the sender address, do they? There are some
limitation mentioned, but non of them apply to the sender address.

I'd assume that people using cutthrough_delivery with SRS would expect SRS to
be applied with cutthrough_delivery, and myself I'd certainly appreciate a way
to set envelope sender upon cutthrough_delivery.

I like the proposed idea. Would sender=transport also take into consideration
errors_to router settings (as those would affect the transport's return_path)?

But this bug can be fixed simply by documenting that envelope sender does not
change.

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