Nintex Adventurer

User Limit on Email Notification

I have a Nintex 2013 Workflow that I designed as an email blast to our SharePoint Visitors Group. Our visitors group is 2,000+ users and growing. When the workflow is ran it states it completed successfully; however, no one is receiving the email. I ran the workflow on a smaller group for testing and it worked fine. Is there a limit on the number of users that can be in an email notification? 

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