https://bugs.exim.org/show_bug.cgi?id=3037
--- Comment #1 from Jeremy Harris <jgh146exb@???> ---
It's unlikely that ARG_MAX is involved since that is a limit on execv;
but the message gets passed to a transport filter on it's stdin.
Try just running 'cat" as your filter. If that works, then the problem
is more likely in your modifymail.sh script. Please don't tell me
it hacks on Exim's spool file; this is not a public interface for Exim
and you should not do that. A transport filter should operate stdin=to-stdout
as a stream processor.
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