how to exclude email from notify?

Hi all!

when comes to email, macro initiator sends an e-mail that the treatment received by the system.
Conditions macro:

open in $L.new="Open" and null(cpx.impact in $L.new)

E-mail information about the macro takes from callback.contact:

How can I exclude from sending one particular contact?

callback.contact in $L.new ~="username"  and (open in $L.new="Open" and null(cpx.impact in $L.new))

It leads to the fact that the macro does not work.