If you advertise in the Netherlands, you must observe the rules on misleading and comparative advertising. Advertising is misleading if you make claims which are incorrect or incomplete. It is comparative if your advertisement refers to the name of the competitor’s product or service. Comparative advertising is permitted but may not be misleading.
Also, you are not permitted to send any electronic messages for commercial, non-commercial or charitable purposes to private individuals or companies by e-mail, telephone (sms or mms) or through social media like Twitter and Facebook without the recipient’s express consent as this is considered spamming. In addition, people must always have the opportunity to ‘opt out’ of receiving email advertising.