[exim] How do keep exim from sending out any bounces?

Hi,

for some tests, I intend to have my main mail swerver forward all mail
to a test machine _additional_ to local delivery. Hence, I am
duplicating all mail. Can I easily keep the test box from sending out
any bounces at all?

Or is the safest bet to run the test exim in queue_only mode with no
queue runs at all?

Any hints will be appreciated.

Greetings
Marc

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