On Tue, Jun 17, 2025 at 10:18:42AM +0100, Jeremy Harris via Exim-users wrote:
> On 2025/06/17 4:11 AM, Viktor Dukhovni via Exim-users wrote:
> > I am slightly surprised Exim ended up going with LOGIN rather than the
> > much simpler PLAIN, perhaps this choice was made by some underlying
> > library, ...
>
> The server offered both; the Exim client is configured with at least LOGIN -
> but if configured with both then LOGIN is first in the config so took
> precedence. Anyone caring could just swap them.
>
> The actual implementations for the two are so similar that they are
> handled by a single driver.
If this is a matter of defaults, FWIW (not much in my case as a
non-user), I recommend preferring PLAIN over LOGIN by default,
simply because fewer round-trips mean lower submission latency.
--
Viktor.
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