A selection of the large number of postcards sent to Jessie SUTHERLAND from 1910+
Very few have family information on them, and are more like the txt messages of today, albeit taking somewhat longer to arrive.
They do appear to rely on a regular and quick postal service though as some do mention appointments within the week of posting.

From Annie posted Weisdale Jul 1910 to Miss Jessie Sutherland, Post Office, Cunningsburgh, Shetland

From Annie posted Walls July 1911 to Miss Jessie Sutherland, Post Office, Cunningsburgh, Shetland

Undated, unsourced photo of Cunningsburgh, Shetland, taken by J D Rattar