Ensure that emails from specific addresses reach your Inbox, and not your junk or spam folder, by adding them to a safe senders list, which is also called "whitelisting".
Your email provider or security service (if you use one) has their own instructions for adding email address to a whitelist. Find the instructions listed here, or look up instructions with the provider or service you use. If you're instructing your contacts to add your email address to their safe sender lists, make sure they add the address you use in your From Email Address line. You might want to ask your contacts to add the Constant Contact website to their whitelist or safe sender list as well.