Would this work if it is '<>' as it most commonly is? Then it is truly not blank... I think Block Null Sender covers this instance. It would be nice to have an alternative that was RFC compliant.
It would probably be best to use both:
MAILFROM 2 ISBLANK
and
MAILFROM 2 IS <>
That way, whichever format IMail may choose to use will be caught.
-Scott
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