Hi RosemaryL7!
Thanks for reaching out to the Community with your question! Our contacts system is designed to prevent duplicates, so you can upload the same list of addresses over and over without worry. The new contacts will be added, and any existing contacts will be updated with new information.
If you would like to double check this you can:
Kara.D
Community & Social Media Support
Did I answer your question? If so, please mark my post as an
"Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.
You're not alone on your email marketing journey. Connect with a Marketing Advisor to see how they can help you develop the right strategy for your business and get the most out of your Constant Contact experience.