She didn't realise that you don't put an X on every communication. So she even put it on business letter including one to the Inland Revenue, which is the government department in the UK that deals with tax.
So make sure you're not one of them, especially if you sign your letters saying: " Sincerely, " or: " Yours sincerely, " which is a very common way to end a general letter or a general business letter.
" Right-hand drawer violet monogram for the notes, plain paper for the business letter. I'll see to that, though, " answered Rose, trying to decide whether Annabel or Emma should have the laced handkerchief.
You will hear people say " to date" in spoken English, especially if they are talking about business letters or reports or contracts, something in a more formal setting.