https://bugs.exim.org/show_bug.cgi?id=1643
--- Comment #3 from Phil Pennock <pdp@???> ---
Where did you see these examples? In the Exim documentation? Elsewhere?
We can reach out to people and try to get them to update bad examples, but
generally "it's on the Internet" isn't a good enough indicator of
trustworthiness. The Exim Specification is the canonical documentation; it
comes with Exim in text format, is available for download in multiple formats
and is accessible via the
http://www.exim.org/ website.
There's the potential for some improvement here, like "reject empty strings",
but what when the value is "no" or "0" ... we're playing a losing game of
chasing after all the ways that people can screw up. The docs are very clear,
fail the expansion if you want auth to fail because you can't provide a secret.
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