What are rubber stamps? Why is the use of rubber stamps detrimental to building goodwill with a reader?

Rubber stamps are expressions used by habit every time a certain type of situation occurs. They are used without thought and are not adapted to specific situations. As the term indicates, they are used much as you would use a rubber stamp. Because they are used routinely, rubber stamps communicate the effect of routine treatment, which is not likely to impress readers favorably. Such treatment tells readers that the writer has no special concern for them-that the present case is being handled in the same way as any other. In contrast, words specially selected for this case show the writer's concern for and interest in the readers.