Hi,
Can you elaborate your question? Y is it sending duplicate emails?
When will it send duplicate emails?
If i understand your question correctly, User is being part of different groups when you send emails to groups , the same email is being sent, is it right?
If yes, Add a Two option set, Create a Plugin on Create Email and write logic to Update new field with yes when it sends first time and Check the value every time before an email sent.
Hope this helps.
Thank you,
Thank you, Sreeni Pavalla Please Vote as Helpful and Mark As Answer if it helped you. Blog: https://sreenipavalla.wordpress.com/