Hey @GSX,
Thank you for reaching out to us! That is a great question. Yes, Constant Contact does filter out duplicates when you choose multiple lists when a Campaign is sent. Hearing that a customer received the 5 times makes me wonder if they have multiple different email addresses forwarding to one inbox. We would be happy to investigate to help get to the bottom of this! If you could email us your username, the campaign you sent, and the email address that received multiple copies we will do some digging! Social_Support(at)Constantcontact(dot)com
Desi_B
Community & Social Media Support
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