https://bugs.exim.org/show_bug.cgi?id=2250
--- Comment #8 from David Carter <dpc22@???> ---
> I suggest modifying Exim so that it doesn't return 5xx on NULL characters.
> Return 4xx instead so that it will retry? That way you can collect more
> instances of the issue without dropping messages.
Presumably if a single recipient in a long list gets a 4xy response then
delivery would succeed when the sending end retries delivery later for the
single recipient?
That would fix the problem, if not the underlying cause.
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