Cox has marked my email server as a spammer - how to resolve?
I am using Siteground Hosting for my business websites and email addresses. Cox has recently marked my email server's IP address as spam. At least I am getting non deliverable notices from Cox. I have tried from 2 separate email addresses and both have the same failure notices. Here is a copy of the message with personal info redacted:
Reporting-MTA: dns; se19.mailspamprotection.com
Remote-MTA: dns; cxr.mx.a.cloudfilter.net
Diagnostic-Code: smtp; 421 cxr-ibgw-5007a.stratus.cloudmark.com cmsmtp 220.127.116.11 blocked. Refer to Error Codes section at www.cox.com/.../email-error-codes.html for more information. AUP#CXCNCT: retry timeout exceeded
The email server ip address that is being blocked is 18.104.22.168 and does not show up on any spam blacklists that I can see.
I can give you the email addresses if you need them, but do not want to post them to a public forum.