When I write a letter,
Dear Mr Smith
Dear Mr Smith,
which one is correct?
Hello Cateran
Both are correct in British English. But if you omit the comma after "Dear Mr Smith", you should also omit it after "Yours sincerely".
It may be different in American English.
MrP
Dear MrP
Your answer is valuable. Thanks a lot.
Yours sincerely
Cateran