What is a potential cause for email delivery issues in iCloud?

The identification of failed health checks as a potential cause for email delivery issues in iCloud emphasizes the importance of system stability and performance monitoring. Health checks are procedures that test the functionality and responsiveness of various systems, including email servers. When these health checks fail, it often indicates underlying problems such as server overload, configuration errors, or connectivity issues between the server and the internet, which can directly impact the delivery of emails.

In this context, while server maintenance, network connectivity issues, and incorrect passwords can certainly affect email functionality, they do not pinpoint the internal operational status of the iCloud systems as directly as failed health checks. Failed health checks serve as a diagnostic tool, revealing whether the infrastructure supporting email delivery is functional and optimized for user access. Therefore, recognizing failed health checks as a potential cause sheds light on the systemic issues that can lead to email disruptions.