What does the Policy type "Block on Size Policy" refer to?

The "Block on Size Policy" refers to a mechanism that specifically addresses the size of the email content, determining whether it should be blocked based on the overall size of the message. This policy typically aims to prevent excessively large emails from being delivered, which can consume bandwidth and storage resources, potentially impacting system performance.

By using this policy, organizations can enforce rules that reject incoming or outgoing emails that exceed a set size limit, thus maintaining operational efficiency and ensuring that email systems remain responsive. It is an effective way to manage email flow in environments where large attachments may hinder communication or cloud storage limit capabilities.

The other options describe facets related to email restrictions based on size, but they do not capture the essence of blocking emails specifically due to their overall content size, which is the core function of a "Block on Size Policy."