Which method is an inappropriate choice for delivering a particular message?

Using postal mail to send urgent messages is inappropriate because it typically does not provide the immediacy that urgent communications require. Urgent messages often need to be delivered quickly so that the recipient can take timely action. Postal mail, which can involve several days of transit time, fails to meet this need.

In contrast, face-to-face meetings, email correspondence, and telephone conversations are all methods that allow for immediate interaction or response, which is crucial when conveying urgent information. Both face-to-face and telephone conversations offer the benefit of real-time engagement, while email can provide a faster delivery compared to traditional mail, especially for non-urgent matters that perhaps even require documentation.