[Exim] how to bounce and keep messages

Hello,

I have following Scenario:

I want to receive Mails bigger than e.g. 15MB,
but I want to create a autoreply after receive,
that the message exceeds the allowed size.

Can somebody provide me a config with
router / transport etc.

which works like this.

thanks

thomas

Thomas Baumann // tirili+list.exim@???

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