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CasselJCasselJ 

Process Builder get Email address from another object based on information from current record and send email\

I have a process that is trigger on a reccord change. I would like to  use the value in a field of the current record, as criteria to return a user In a custom object so that I can send that user an email. 
ShivankurShivankur (Salesforce Developers) 
Hi There,

You could first establish a relationship between the custom object and the object on which process builder is setup and then use the field as criteria in process builder.

Once you have a record change the process builder would check with the defined criteria and fire the action. So, in action you would need to put send email action via Apex.

You can find similar implementation over below link:
https://jenwlee.com/2016/07/05/standard-email-message-object-process-builderflow-use-case-create-task-when-follow-up-email-sent/

Hope above information helps. Please mark as Best Answer so that it can help others in future.

Thanks.