What function does the submission queue serve in Exchange Server?

The submission queue in Exchange Server plays a crucial role in managing the flow of outgoing emails. When a user sends an email, it is first placed in the submission queue before being processed for delivery. This queue serves as a temporary holding area where emails can await delivery to their intended recipients, either within the same Exchange organization or to external domains.

By queuing outgoing emails, the submission queue allows the Email Transport Service to efficiently manage the processing of email messages. It helps mitigate issues such as network congestion or server load, enabling the server to handle high volumes of email traffic smoothly. Additionally, the emails in the submission queue can be managed, allowing for retries in case of temporary delivery failures or prioritization of specific messages.

Options regarding storing incoming emails, managing user permissions, or archiving older messages relate to different aspects of email handling and storage in Exchange Server, but do not directly pertain to the function of the submission queue, which is specifically designed for queuing outgoing emails for delivery.