On 11/11/2020 16:29, Ian Zimmerman via Exim-users wrote:
On 2020-11-11 13:16, Jeremy Harris wrote:

Semi-radical: provide an ACL, router, and transport modifier that
checks some variable or content for dangerous contents

We have that.  All data provided by an untrusted source, described
as "tainted" for a shorthand.

I will not argue with the rest of your post, but it is not a _modifier_
if it is always on.

Ah.  Would an expansion condition be sufficient?  So you could write

  ${if  tainted{my_suspect_expansion}  {expand_this} {expand_that}}

That would be simple to code and test.
--
Cheers,
  Jeremy

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