Comcast email rejected error code ES000010


EQ Forum Admin
Staff member
According to comccast support you have been blocked from emailing the Comcast network because we have determined that you are sending email from dynamic/residential IP space. Comcast does not allow residential/dynamic IP addresses to directly connect to our mail servers. In most cases, Comcast will classify your mail server's IP address as dynamic if the reverse DNS does not comply with standard static naming conventions.

How do I get my IP removed from the blocklist?

It is important that you ask your mail provider to review the settings of your email server to ensure it is set up correctly so that it is not blocked by Comcast in the future. When contacting your email administrator, you should include the error message contained in the email which alerted you to this problem. This error message contains important information to help your email administrator resolve this issue. Once the settings are changed to reflect static naming conventions, you do not need to submit a request to be removed from the blocklist as mail should be accepted automatically. If your mail provider can not change their naming conventions, they may contact Comcast's CSA Department for further assistance.