We are aware of intermittent issues with outbound email on our Pro email services. Updates will be available from Titan via their status page available here: https://status.titan.email/
We will provide updates as we receive them.
UPDATE 3:05PM EDT: Titan's Operation team is working to resolve this issue. They have identified the issue and are working to implement a fix.
UPDATE 3:25PM EDT: Titan has reported the issue is resolved (https://status.titan.email/incidents/b2cvlj3njm5t). If you are still experiencing issues, please reach out to our Support team for assistance.