personal letter

Cannot remember the last time I wrote or received a personal letter and a good thing too perhaps.

It is sometimes used for writing personal letters to people.

It was too highly personal a letter, for one thing.

A personal letter of any sort, sent first class, will be read and noticed.

Seeking the help of a third party to write a personal letter is nothing new.

Because each student needs at least two personal letters, some teachers end up writing dozens every year.

I wouldn't mind writing you personal letters at my expense.

They will have a personal letter from me, and the names of all our officials to be informed.

He sat down to write his report and, once again, it became a personal letter to Katherine.

Explanation: We know it is wrong to read someone's personal letters.