https://bugs.exim.org/show_bug.cgi?id=2724

--- Comment #6 from Simon Arlott <[email protected]> ---
(In reply to Simon Arlott from comment #4)
> "EAI-MTA-013  FAIL    EAI messages sent to non-SMTPUTF8 server are rejected
> Message sent anyway"
> 
> This refers to non-ASCII local parts so it's probably a bug but there's no
> evidence (Exim log file) to prove it.

On 03/05/2021 20:26, Andrew C Aitchison via Exim-dev wrote:
> I am not convinced that rejecting or transforming mail is better
> than relaying it to a non-SMTPUTF8 server.

Yes, it's kind of like how Exim relays 8BITMIME without any transformation.

There is no way to transform a non-ASCII local part, so the simplest action
(other than rejecting) is to attempt to deliver it and let the remote server
reject it if it's unable to handle it.

I don't see a test case for "given a non-ASCII local part when SMTPUTF8 not
advertised".

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