@Francisco1988 I suggest you to follow @MultiTech's method, I have something like that on almost all of my apps (maybe all of them).
In your case, if you consider it overkill or you need a fast solution while you wrap your head around @MultiTech's tip, use a List() expression to add all of the users you want to exclude (or include, depending on your need)
# This is to have a list of allowed people
IN(
USEREMAIL(),
LIST(
"EMAIL1@EMAIL.COM",
"EMAIL2@EMAIL.COM",
"EMAILN@EMAIL.COM"
)
)
# If you need to have a list of unallowed, just wrap with NOT()
NOT(
IN(
USEREMAIL(),
LIST(
"EMAIL1@EMAIL.COM",
"EMAIL2@EMAIL.COM",
"EMAILN@EMAIL.COM"
)
)
)
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