The information that we store about our contacts could, be subject to Data Protection rules, like the General Data Protection Regulation (GDPR) if your contacts or your company resides in Europe. There are different rules for different countries and regions, and you should make sure that you are up-to-date with the relevant ones for you and your contacts. A general rule of thumb is to only store necessary information, and make sure that you are organized with your contact records and only send them relevant communications.
Learn on the 5 Best Ways to Organize & Keep Customer Records.