This function allows you to remove from a list of postal addresses those addresses whose owners do not wish to be contacted or who should not be contacted for any other reason. To do this, a second list is required: the black list.

To block individual addresses or specific groups of addresses, the black list can contain entries in the following format:

• a complete postal addresses
• Surname='Einstein' + Street='' + Postcode='' + City='Berlin' => all addresses with the surname 'Einstein' in 'Berlin' are blocked
• Surname='Einstein' + Street='' + Postcode='1234' + City='' => all addresses with the surname 'Einstein' and the postcode '1234' are blocked
• City='Berlin' => all addresses in 'Berlin' are blocked