Variables in conditions

in my .procmailrc, i set an environment variable like
MYVAR = something
i want to use it in a condition like
* TOsomething(_at_)mydoma(_dot_)in
but
* TO${MYVAR}
isn't matched, nor is
* TO$MYVAR or * TO ${MYVAR}(_at_)doma(_dot_)in

could someone point me in the right direction?

thanks,
wolfgang

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