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    Type:Bug Report 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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        2
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        Not defined
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        3 - Expected
Brief summary of the bug. What is it ? Where is it ?
When configuring an alert, the alert form doesn't validate the entered email against the list of Optimize user email addresses
Steps to reproduce:
1. Create an Alert in Cloud
2. Enter a non-Optimize user in the email address
Actual result:
Vague warning message
Expected result:
(OK) valid explanation of why the request was rejected OR
(Better)In-form validation of the email OR
(Best) User picker for selecting an email in cloud modes{}