What best explains why this e-mail is an example of good email etiquette is the professional tone with which it is written, as it is a work e-mail.
Organizational communication is essential for the effective flow of information that impacts operations, so a cordial and professional e-mail contributes to a better interpersonal relationship and the creation of a positive organizational culture.
Please note that the e-mail is written in an order form, which is a friendly way to communicate something work-related to your colleagues.
Therefore, even if a company has needs to complete tasks, transfer information and respond quickly, communication by email with work peers must be carried out in a bi-directional, ethical and cordial manner.
Learn more about e-mail etiquette here:
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