Hello @AndyC57 ,
Based on what you're describing, I'd advise going through these articles to gather the info your need for your records:
Include Constant Contact IP Addresses in Your SPF or SenderID Record
Self-authenticate your emails using your own domain
Safelist Constant Contact web domains in a security program
If these articles are unable to assist with including that domain, I'd advise speaking with our Delivery team for more specialized insight and assistance.
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