Exim Filter Specification section 27

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## 27. Testing for error messages

The condition `error_message` is true if the incoming message is a mail delivery error message (bounce message). Putting the command

      if error_message then finish endif

at the head of your filter file is a useful insurance against things going wrong in such a way that you cannot receive delivery error reports, and is highly recommended. Note that `error_message` is a condition, not an expansion variable, and therefore is not preceded by `$`.

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