If you don’t know the name of the individual,address it to the individual’s title in the company OR organizationand then use dear Sir or Madam:Here is an example:
Head of Human Resource
ABC Company/organization
123 Sesame Street
Dear Sir or Madam:
如果你知道你收信人的名字的话,那只要
公司或者机构的 地址.
然后 Dear Ms./Mr.