EmailMessageDirectionFilter
public enum EmailMessageDirectionFilter : EquatableFilter for a EmailMessage.Direction.
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                  Filter by equality of EmailMessage.Direction.DeclarationSwift case equals(EmailMessage.Direction)
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                  Filter by non-equality of EmailMessage.Direction.DeclarationSwift case notEquals(EmailMessage.Direction)
 EmailMessageDirectionFilter Enumeration Reference
      EmailMessageDirectionFilter Enumeration Reference