What is the proper salutation if the letter is addressed in general?

Answer 1

The classic non-sexist general salutation is "To Whom It May Concern:" It is also acceptable to use "Ladies and Gentlemen:" (my personal preference) or any other polite non-sexist phrase that is appropriate to your audience -- "To The Recipient Of This Letter:" or "Dear Recipient:" If you have any information about the nature of your recipient(s), you can use it to narrow the generality of your salutation -- "Dear Admissions Counselor:" or "To The Customer Service Staff:" or "Dear Service Representative:" or "Dear Animal Welfare Supporter:"