How Constant Contact and MailChimp Manage Bounces

Although MailChimp and Constant Contact both deliver bulk email, MailChimp manages bounced emails differently to ensure high delivery rates. Before you move your list from Constant Contact to MailChimp, you may want to review or clean your Contact Contact list.

In this article, you'll find information on bounces and how Constant Contact and MailChimp each manage bounces.

What are bounces?

When your email can't be delivered to an email address, it's called a bounce. Here are a few common reasons for bounces.

  • Email address doesn't exist
  • Recipient's mailbox is full
  • Recipient's email server has blocked delivery

Internet service providers (ISPs) require MailChimp and Constant Contact to enforce email bounce rates that remain below industry standards. The lower the bounce rate, the better the reputation it has with ISPs. This translates to high email delivery rates for users.
About Bounces

How do Constant Contact and MailChimp manage bounces?

Both Constant Contact and MailChimp report bounced email addresses, but what they do next is a little different. Constant Contact allows its users to manage their own bounces and remove them from their list.

MailChimp monitors bounces and automatically removes email addresses from the list when they bounce for a permanent reason like when an email address is nonexistent. We'll save these addresses in the cleaned section of your list, so you can't send to them again. 
View Cleaned Addresses

Do I need to do anything?

When you export a list from Constant Contact, it includes all the email addresses in your list, including bounced email addresses. If all of the bounces are imported into your MailChimp list, it could result in a bounce warning or bounce suspension.

Before you export your active list as a CSV file from Constant Contact, check the Recommended for Removal category in your Constant Contact account and delete those addresses.

Import Contacts from Other Services

Best Practices for List Management 

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