英文信件开头说我们是啥啥协会的,应该怎么表述啊,国家政府之间的信件,

Dear Sir/Madam,This is from XXX Association。orMy name is XXX,President of XXX Association。or (Anything can represent your association。)Normally in English formal letters,the sender's information,address,date,organization etc。,is written at the very beginning of the paper,on the right upper corner of the page,the receiver's information is written a little bit lower than sender's and on the right side of page。Like this:Sample of Association123 Main RoadWonderland,AL,00000Jan。1st 2000The DirectorSample company321 Washington RoadFun Place,CA,99999(then the letter)