Error: No recipient found while sending Email and How to ignore this kind of users

Error: No recipient found while sending Email and How to ignore this kind of users

  
Hi ALL,

I am implemented an email functionality and its working fine. But for some of my users email is column for structure is appearing as below. I want to ignore this kind of users before sending mails. Can anyone suggest how to ignore them without aborting mail functionality.
Please refer below I am getting email field of structure as below


 
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