What is the difference between mixed case and postal case?
Mixed case uses a mixture of upper and lower case characters for all elements of the address. Upper case letters are used for the first letter of each word except the postcode, which is all upper case. In postal case, the upper and lower case mixture is used for all elements except the post town and the postcode, which are both in upper case. This is the Post Office approved format and makes the post town and postcode stand out from the address, which makes sorting much easier.
