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In context to email security, what type of content filtering can be performed using the SMTP proxy?

  1. Restrict emails based on sender authentication.

  2. Block emails containing specific attachment types.

  3. Allow all emails without restrictions.

  4. Prioritize emails based on recipient addresses.

The correct answer is: Block emails containing specific attachment types.

The use of an SMTP proxy for email security allows for various filtering capabilities, particularly when it comes to managing the types of content that can be sent and received via email. Blocking emails containing specific attachment types is a key function of content filtering that an SMTP proxy can perform effectively. By configuring the SMTP proxy to identify and block particular attachment types, organizations can mitigate risks associated with potentially harmful file formats, such as executable files or documents that may contain malware. This preventive measure is crucial in protecting network security and ensuring safe communication within an organization. It helps minimize the chances of users inadvertently downloading or opening malicious content that could compromise the system. In contrast, other options describe functionalities that are not primarily the focus of SMTP proxy filtering. While restricting emails based on sender authentication pertains more to validation protocols than content filtering, allowing all emails without restrictions would negate any security measures, thus increasing vulnerability. Similarly, prioritizing emails based on recipient addresses deals more with email management and delivery rather than the actual content being filtered. Therefore, blocking specific attachment types stands out as a crucial and relevant feature of SMTP proxy capabilities in email security.