Through Netbookings, databases are able to be exported for use.
Navigate to System > Database > Data Export
Choose Table/Export Type
Select which table you wish to export from, as well as what the data will export as.
Alternatively, you may wish to export only the emails of guests/customers that have signed up for newsletters.
Navigate to System > Database > Data Export.
Export Data/Export All
By not checking ‘Export All’, only the emails that have been entered since the last export will be pulled.
If you wish to export all data, the checkbox must be ticked.