We've had a significant DDOS attack against the majority of our server fleet within the last several hours. For the most part, users have been shielded from this. However, our busiest users may have noticed intermittent SMTP availability during that time. A complete inability to reach our servers is not expected and may indicate that your IP address was logged performing the same patterns as the attackers. The unblock form is how you automate IP block removal: https://unblock.mxrouteapps.com
This status will remain up as we monitor this situation throughout the day.