Some Constant Contact IP’s are in a blacklist.
Is important and urgent that Support Team of Constant Contact take steps to remove your IPs from the mailspike list.
Please appeal the blacklisting, because many of our recipients are not getting newsletter’s as a result of blacklisting
Thank you for reaching out to the Community. I have taken a look at your account and can see you were able to speak with our support about this as well. In fact this team suggested you to whitelist the Constant Contact 'From' address in your email client as well as whitelisting our web domains in your security program. We also ask that you please call into our Deliverability Department directly. One of these specialists can offer additional assistance with these block listings.