On 02/10/2023 13:44, Adrian Zaugg via Exim-users wrote:
The official communication talks of "EXTERNAL auth": Is it meant for

        driver = external

as mentioned under [1] or any external authentication like

        driver = dovecot

and thus written capitalized? Or does EXTERNAL refer to something completely
different?

Thank you for clarification.

There's two concepts here:

a)  the driver (a module within Exim),
which has the lowercase word as it's label.

b) the ESMTP protocol word used to negociate use of the feature.
Traditionally in all-caps.


For this one there's maximum confusion. The driver only handles the one method.
But the "plaintext" driver (for instance) handles both LOGIN and PLAIN methods.
--
Cheers,
  Jeremy


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