Hello @BradB2568,
It could be related to authentication, but I would have to investigate further! What's the name of email campaign you're working on and what are some of the email client domains you were trying to send to (Gmail, Yahoo, etc)?
It's possible, for example, if it's a private domain like a business, that their security protocols prohibit outside emails from getting through. This can be remedied with whitelisting, but I'll wait until I have more information before we go down that path. I look forward to your response.
Nick S.
Social Media & Content Manager
You're not alone on your email marketing journey. Connect with a Marketing Advisor to see how they can help you develop the right strategy for your business and get the most out of your Constant Contact experience.
