Hi, I wonder if you can further explain why many of our Contacts receive multiple emails please?  These Members do not have multiple email addresses, but they are in several different lists, e.g. they appear on the Member list, they appear on the Completed Survey list, they may also appear on Attended Field Day list; I select all 3 of those lists for distribution of a Newsletter because some Contacts only appear in one of those lists so I require them all.   According to your Help Centre and as per extract below, you have safeguards in place to prevent duplicate email addresses this doesn't indicate that CC can remove duplicate email addresses in one bulk email distribution such as a Newsletter.   Have you some advice for me please? Jen   Contact Received Multiple Copies of an Email Article: 000014974 Updated: January 26, 2017 Troubleshooting why a contact received duplicate copies of an email Although Constant Contact has safeguards in place to prevent duplicate email addresses in your account, it's possible that a contact could receive multiple copies of an email. Here are a few possible causes, along with how you can fix them: Multiple Email Addresses On the Same List A/B Testing Automatic Forwarding Mail Servers or Firewalls ... View more