Here is the text of a note from the Post Office, quoted in “Berry and Co”, which was written by Dornford Yates and published in 1920:
I beg leave to inform you that your telegram handed in at the Grosvenor Street Post Office at 10.2 am on the 26th June addressed to Reply paid Hamilton Smythe Fair Lawns Torquay has not been delivered for the reason indicated below.
ADDRESS NOT KNOWN
I am, Sir, Your obedient servant,
Should letter-writing conventions be used in emails? Photo (c) Henri Burgius http://www.