[exim] truncate incoming bounce msgs

Hello,

How could I truncate incoming bounce msgs on exim?

I tried bounce_return_size_limit but obviously this
truncates bounce msgs generated only by exim running
on localhost, not incoming DSNs (for example).

Should I use, for example, transport_filter and do
whatever I want with the msg's body? Is there any
other way?

Any ideas?

Thanks
Ilias

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