The letter should specify the full name of the recipient (s) of Indonesia, Santosa Mr.Sudjana in cases where there is contact with the prefix name such as specify, Dr..
In formal letter Should state the full name of the recipient, such as the Indonesian Mr.Sudjana Santosa in case of contact with articles like Dr. would be, too.
In a letter in the name of the recipient should be full of Indonesian, such as Mr.Sudjana Santosa in case of contact with the article, such as Dr. Can identify with.