Step 1: On the Account Module, click on User Accounts.
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Step 2: Find the account of the employee and click on the Login Name.
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Step 3: Edit the Email section then click on Update to have it saved.
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After which, kindly have an employee file an AEF to test if the new email will be able to receive a notification. If yes, please inform your IT to check for any incoming email restrictions for 3rd party domains applied on your company email server.