Blacklist notification

Level 1

Blacklist notification

Is anyone else getting blacklist notifications that say the following: 

Type: Network Solutions Date: 5/6/19

Our IP address is listed after this but I'm leaving it off this post.  I have looked in our 250ok instance and there is nothing listed there.  

We use dedicated IP's if that helps at all.  

We opened a support ticket the last time this happened and they could basically tell us nothing as it related to this.  Said maybe we were removed from the blacklist by the time we looked at 250ok but that seems suspicious as this time, I looked within 20 minutes of receiving the notification from Marketo and nothing was being reported.

Anyone have any insight?