Exim Filter Specification - Numeric testing conditions

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## Numeric testing conditions

The following conditions are available for performing numerical tests:

         <number1> is above <number2>
         <number1> is not above <number2>
         <number1> is below <number2>
         <number1> is not below <number2>
    e.g. $message_size is not above 10k

The <number> arguments must expand to strings of digits, optionally followed by one of the letters K or M (upper-case or lower-case) which cause multiplication by 1024 and 1024x1024 respectively.

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