System/Library/PrivateFrameworks/MailSupport.framework

MSSenderBlockingTriageAction.h

NSObject
>
MSTriageAction

@interface MSSenderBlockingTriageAction : MSTriageAction {
    BOOL _blockSender;
}

- (id)_changeAction;
- (id)initWithMessageListSelection:(id)a0 origin:(long long)a1 actor:(long long)a2 delegate:(id)a3 blockSender:(BOOL)a4;

@end