Can freelancers legally send an 'unsolicited' paper letter ('snail mail') containing a business offer to prospective clients (whose postal addresses are freely given online)? Or is this also illegal (just like 'unsolicited' electronic mail)? Probably one would have to read the respective country's law on unsolicited email (based on the EU directive 'Privacy and Electronic Communications Directive 2002/58/EC' (Article 13), to see whether it also prohibits unsolicited regular mail (though the original EU Directive only regards electronic mail). Unsolicited postal mail might fall however into the area of 'unfair competition' or 'unfair business practices' (something like 'Wettbewerbsverzerrung') and be prohibited by other EU directives, or country laws, dealing separately with 'surface mail' advertising.