Which attachment-based policy is required for holding messages with certain file types in a ZIP file?

The required attachment-based policy for holding messages with certain file types in a ZIP file is centered around the idea of identifying and managing potentially harmful attachments. The policy labeled "Suspected Malware" is designed specifically to filter and hold messages that may contain files that exhibit characteristics of malware, which is critical for protecting users and systems from viruses and other malicious content.

ZIP files often serve as a method for compressing files, which can include executable programs or other file types that could harbor malware. By holding messages containing ZIP files under this policy, organizations can take a precautionary approach to evaluate the contents of these attachments before they reach the inbox, thus reducing the risk of introducing harmful software into the network.

In the context of email security, this approach is vital for maintaining the integrity of systems and safeguarding sensitive data, making the "Suspected Malware" policy a key element in an organization’s overall email security strategy.