Comment 36 for bug 2056372

Thanks for doing some testing around the quotes, was that with using /usr/bin/bash?

Also the lead I had was the changelog entry from upstream:
JH/24 The ${run} expansion item now expands its command string elements after
      splitting. Previously it was before; the new ordering makes handling
      zero-length arguments simpler. The old ordering can be obtained by
      appending a new option "preexpand", after a comma, to the "run".

So I tried using ,preexpand to hopefully get it to work and unfortunately just see a parsing error now, similar to [0].

[0] - https://www.mail-archive.com/search?<email address hidden>&q=subject:%22%5C%5Bexim%5C%5D+Failed+to+expand+ACL+string%22&o=newest&f=1