The issue affecting Alternate Port SMTP has been resolved the queue backlog as normalized. All systems are operational.

Connectivity has been restored. Alternate port SMTP mail that was delayed is now moving through the queue and being delivered. Expect queue delays for the next hour or so while the backlog processes. We will continue monitoring.

We are seeing delivery problems on our alternate port SMTP service. The cause is a routing problem affecting part of the network our mail servers send from. Our team is working on a fix. We have a temporary reroute in place to keep traffic moving while we sort out the underlying problem. One known limitation: mail sent to a group address or through a forward may still bounce, depending on how the receiving side is configured. We will post an update here as soon as we know more.