If you address it to no one in particular, no one may receive it at all. Country names should always be in capital letters, making them easier to read when sorting. When setting up a database, postal codes should be in a separate fixed field. That goes for countries, too. This way, you can always sort based on those criteria.
Canadian mail sorted by postal codes enjoys postal savings.
For example, this would result in a five character postal code for Canada when it should be six. Also, in the US, states are indicated as a two-character code. This field would then be used in some other countries for provinces, which might not necessarily be curtailed to just two characters. In recent months, we have noticed more mail than ever is missing a full address line of information. Interestingly, we've also noticed that most of the time these mailings have been addressed by an inkjet machine, rather than by label print out.