When we are shutting down, the ShutdownSubscription will initially wake us up from a sleep, then will always be immediately signalled for the rest of the lifetime of the program. Since we use it being signalled as a wakeup, it will effectively cause a busy loop where we never sleep the ready queue while we wait for the queue to wrap up. Avoid that by ignoring the ShutdownSubscription once we realize that we are shutting down. A similar situation can occur with refreshing the configuration; when shutting down, we can simply ignore that.
KumoMTA
KumoMTA is an open-source Message Transfer Agent (MTA) designed for high-performance outbound email functionality, similar to commercial enterprise MTAs such as Momentum, PowerMTA, and Halon.
The KumoMTA project was founded by a group of email industry veterans with decades of experience building and managing high-performance On-Prem MTAs and is supported by a community of some of the largest senders in the world.
Because it is designed for high-performance sending environments, KumoMTA is for experienced email operations professionals who are accustomed to high-performance sending environments and familiar with DevOps practices.
Learn more in our FAQ and at https://kumomta.com/.
Documentation
You can learn more about KumoMTA from the Documentation.
Community
Real-time discussion is available on Our Discord.
Developers
If you are interested in contributing/extending KumoMTA, take a look at DEVELOPERS.md. The #devel channel on Our Discord is for contributors to discuss KumoMTA development.
Reporting Bugs
See How to Report Bugs.
Getting Help
See How to Get Help. For paid support see https://kumomta.com/support.
Getting Updates
You can subscribe to updates at https://kumomta.com/subscribe, we send updates periodically and will never sell nor share your information.
Talk to Us
We're available to talk about the project, book us at https://cal.com/team/kumomta/talk-with-kumomta.