Express Ideas Positively Rather Than Negatively

A positive message will be more adaptable to its audience. 

Negative message:

 "Your message can't be shipped before June 1st" 

Positive message:

                  "Your order can be shipped June 1st"

(Reference: Guffey, M., & Loewy, D., & Rhodes, K., & Rogin, P.(2013). Business communication process and product. Adapting a Message to Its Audience, p.90)