Mail10 black listed

I’m frustrated enough with the lack of support that I’m posting here, hoping someone more senior will actually look at this issue.. As of last night, Mail10 is black listed on multiple DNSBL’s.. I got a response of server IP changed, but I’m still not getting email to go out for multiple customers of mine.. Can someone please look into this and get the server fixed up so mail starts flowing again?

Thank you

We are using smarthost on Mail10 to stop outgoing spam emails. So Mail10 IP listing on RBL will not be the cause of issue. We have already changed mail outgoing IP on smarthost with good reputation. If you are still facing same issue then please update us with the support ticket id if you have raised any.