UK law, in my case. You need consent and recipient must be able to unsubscribe. Some parts of this are also covered under the Data Protection Act, which is gen

UK law, in my case. You need consent and recipient must be able to unsubscribe. Some parts of this are also covered under the Data Protection Act, which is generally taken very seriously (by government, at least) in the UK. You can only use data for the purpose for which it was collected. So just because you have my email address for sending me updates about my order, doesn't mean you can email me with offers unless I agreed to that.