Acquaint supports two methods of Postcode Lookup :
Internal (default) - as you enter Contacts an internal database of address/postcode is built. The more Contacts that are entered the better Acquaint becomes at pre-filling address fields based on the entered postcode. This is included free with Acquaint.
Loqate - an Internet link to the Royal Mail database containing all UK addresses. This option is charged by Royal Mail on a per-click basis for each postcode lookup and only supports UK postcode lookup.