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Facsimile, or fax, is often regarded as a more effective method for sending confidential documents quickly for several reasons. First, a fax allows for the immediate transmission of documents over phone lines, meaning that sensitive information can be shared almost instantly with the recipient. This speed is crucial in situations where time-sensitive decisions are necessary.

Moreover, fax transmissions offer a level of privacy since the document is sent directly from one machine to another, minimizing the potential for interception during transit compared to electronic communications like email, which can be more vulnerable to hacking or unauthorized access.

Additionally, many organizations still consider faxing a secure method of communication due to its physical nature; a fax is delivered directly to a designated machine, which often requires access to the recipient's specific location. This can help ensure that only the intended recipient is able to view the confidential information, as opposed to email, where documents can unintentionally be forwarded or accessed by others along the way.

While messenger services and standard mail can be used to deliver documents, they introduce delays and may not ensure immediate receipt, which diminishes their effectiveness for time-sensitive confidential communications.