What purposes do persuasive messages serve?

Persuasive messages have both primary and secondary purposes.Primary purposes: 1.To have the reader act and to overcome any objections that might prevent or delay action 2.To provide enough information so that the reader knows exactly what to do Secondary purposes: 1.To establish a good impression of the writer 2.To build a good image of the writer's organization 3.To build a good relationship between the writer and reader 4.To reduce or eliminate future correspondence on the same subject