General-Purpose Mail Filter
Selects the greylisting implementation to use. Allowed values for type are:
Use the traditional greylisting implementation. This is the default.
Use Con Tassios greylisting implementation.
See greylisting types, for a detailed description of these greylisting implementations.
Notice, that this pragma can be used only once. A second use of this pragma would constitute an error, because you cannot use both greylisting implementations in the same program.
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