I apologize your contacts are seeing display changes. This is an experience that has not yet been resolved. It is however something we are continuing to troubleshoot. If you can please email us at social_supprt(at)constantcontact(dot)com with the following information we would be happy to track this experience in your account:
In the meantime, including a view as webpage link in your email is a helpful workaround in the meantime. This URL allows users to view your email without any changes from a contact's email client.
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