Mac OS X Mail can announce new messages with a sound, and if you don't like the default chime, a different flourish is easily substituted....
Mac os X Mail nwere ike ịkpọsa ozi ọhụrụ na ụda, ma ọ bụrụ na ịnweghị mmasị na ndagwurugwu ahụ, a na-edozi ọkwa dị iche .