Since CASL regulations have been implemented (starting in July of 2014) we have been getting many questions about types of permission, so let’s go over what they are:
Express – With this type of permission your contacts have given you their explicit permission to send them emails. This is often done through Sign Up Forms (online and paper) or by getting this permission if you currently have implied permission. It is a best practice to let your audience know what they are signing up for and how often they will get emails. Also you need to include company information (address, phone, etc.) and your name or department.
Implied - This indicated that you have a relationship with the contact but do not have their express permission. The relationship could be that they have purchased from you, volunteered or made a donation. The key to this type of permission is that they did not give you direct permission to email them.