Prefer "Sincerely," "Sincerely yours," or "Yours sincerely." "Truly" almost crosses the line from formal to intimate.

There are many forms. Yours e.t.c. <-- I;'d wrote this with an ampersand & a c, but this stupid system turns ampersands into & <--- see :) Each form, has its place. Look them up and use them each in its place. Yours sincerely, me. :)

I agree with Helen Gish. “Sincerely” is more appropriate for letters addressed to people whom you don’t know very well.

Hi Helen. But when I look it up in the dictionary, it says that we use ‘yours truly’ when we write to someone we don’t know well

Thanks