Exim Filter Specification section 19

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## 19. The testprint command

It is sometimes helpful to be able to print out the values of variables when testing filter files. The command

`` `testprint <text>`
`` `e.g. testprint "home=$home reply_address=$reply_address"`

does nothing when mail is being delivered. However, when the filtering code is being tested by means of the -bf option (see section 2 above), the value of the string is written to the standard output.

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