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Bob_Az's avatar
New Contributor
2 years ago

Blocking Constant Contact emails

On 11/17, Cox blocked the delivery of emails from my Constant Contact account sent to addresses. Successful delivery to the same addresses happened a just a few days before.

The Constant Contact Delivery Support team informed me that I needed to authenticate CC emails sent using my domain, by adding two CNAME records to my domain's DNS:



If you're having similar problems, look at "Self-authenticate your email address" under your Constant Contact My Account -> Advanced Settings for guidance. Because DNS propagation can take up to 48 hours, Cox has prevented me from reaching my subscribers until the fix I apply compensates for their failure.

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  • Darkatt's avatar
    Valued Contributor III

    Cox Mail system prevents mail systems that do not adhere to proper DNS requirements, from sending mail to their subscribers. many SPAMMERS will simply try to setup a mail server with minimal DNS and try to send out thousands of spam emails, and Cox's system of requiring proper DNS prevents it.