System/Library/PrivateFrameworks/CalendarNotification.framework
CALNMSMailAccounts.h
@class NSString;
@interface CALNMSMailAccounts : NSObject <CALNMailAccounts>
@property (class, readonly, nonatomic) CALNMSMailAccounts *sharedInstance;
@property (readonly) unsigned long long hash;
@property (readonly) Class superclass;
@property (readonly, copy) NSString *description;
@property (readonly, copy) NSString *debugDescription;
- (BOOL)canSendMail;
@end