Addressing a person in a formal letter

Is it incorrect to address a person using the following format in a formal letteR, i.e. can BOTH the first and last name be used after Ms. / Mr.?
"Dear Ms. Jane Doe"
or
"Dear Mr. John Doe"
Thank you!

[curmudgeon]

Have a look here;

http://www.usingenglish.com/articles...r-writing.html

Why not register as a member?

[Grotesque]

Originally Posted by Unregistered

Is it incorrect to address a person using the following format in a formal letteR, i.e. can BOTH the first and last name be used after Ms. / Mr.?
"Dear Ms. Jane Doe"
or
"Dear Mr. John Doe"
Thank you!

You use only the family name.
'Dear Mr/Ms Doe'
or
'Dear Mr and Ms Doe'