Where do I find the Blocklist in order to delete it and make room for more blocked emails?
You can find your 'Blocked Senders' in the settings on myemail.cox.com.
You used the wrong domain. It should be .net https://myemail.cox.net
You can find your 'Blocked Senders' in the settings on myemail.cox.com. After logging in, go to the settings icon on the top right corner.
From here, select 'All Settings'. When you select 'Inbox' on the left side menu, you can scroll down to see the 'Blocked Senders'. Here is where you can add and remove email addresses for the account you are logged into. Third party email platforms may have different ways to access this option.
You can find your 'Blocked Senders' in the settings on myemail.cox.com.
You used the wrong domain. It should be .net https://myemail.cox.net
Thank you for catching that CurtB. My apologies for the misdirection.
myemail.cox.com does not exist. Message reads "can't reach this page"
Filter Rules provide a better way to prevent unwanted email than Blocked Senders (Blocklist). The following was created for legacy Webmail but the information is still relevant with the exception of references to spam and spam filtering.
How to: Prevent Unwanted Email | Cox Community
Settings 
> All settings > Scroll down to: Rules > Add new rule
Note: Filter Rules and Blocked Senders are not applied to email going to Spam. Email identified as spam by an online security company may only be prevented by unsubscribing from each sender.
Once in Settings, there is no link "All Settings"
Webmail has a .net domain, not .com.
Use this URL to Webmail: https://myemail.cox.net
Settings 
> All settings . . . 
(in upper right) > Scroll down to Rules > Add New rules
