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If this is 188.8.131.52 (without BP1), you can edit the email id's from Setup -> My Preferences -> 'Enterprise Manager Password & E-mail'
For higher versions, the navigation is to expand SYSMAN menu at the top right hand corner and choose 'Enterprise Manager Password & E-mail'.
Doc reference: http://docs.oracle.com/cd/E24628_01/doc.121/e24473/notification.htm#sthref152