That's a great question! An email successfully being delivered to your contacts is definitely important. If you see an email caught through the security settings of your contacts, whitelisting Constant Contact is a great step for their IT to take. We also have this article on the different bounce types and how they can be managed, as well as our Deliverability Specialists. These support agents can help look further into these contacts or any other contacts that may bounce in your account.
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