I have been blacklisted on CBL. I've installed and ran all updates on all 50 workstations. I've ran all malwarebytes, and AV on all computers. I have a sonicwall pro 1260. I'm not sure how to block all outgoing smtp traffic on the sonicwall. I've gotten delist twice for more than 24 hours now I'm back on it. What else do I need to do. Please help.
On my firewall - services under my mail services I have: