If you're using an IP whitelist, then you'll need to make sure that all our Linnworks Printing Servers are on your list so you can print invoices and labels through Linnworks. The following DNS names for these servers are
eu-printing.linnworks.net
eu-printing1.linnworks.net
eu-printing2.linnworks.net
eu-printing3.linnworks.net
eu-printing4.linnworks.net
eu-printing5.linnworks.net
eu-printing6.linnworks.net
eu-printing7.linnworks.net
eu-printing8.linnworks.net
eu-printing9.linnworks.net
eu-printing10.linnworks.net
eu-printing11.linnworks.net
eu-printing12.linnworks.net
eu-printing13.linnworks.net
eu-printing14.linnworks.net
eu-printing15.linnworks.net
eu-printing16.linnworks.net
eu-printing17.linnworks.net
us-printing.linnworks.net
us-printing1.linnworks.net
as-printing.linnworks.net
as-printing1.linnworks.net