Email marketing and SMS are entirely permission-based
Bulk messaging is the dissemination of large numbers of SMS messages for delivery to mobile phone terminals. It is used by media companies, enterprises, banks and consumer brands for a variety of purposes including entertainment, enterprise and mobile marketing.
Bulk messaging is commonly used for alerts, reminders, marketing but also for information and communication between both staff and customers.
Bulk mail broadly refers to mail that is mailed and processed in bulk at reduced rates. The term is sometimes used as a synonym for advertising mail.
The United States Postal Service (USPS) defines bulk mail broadly as "quantities of mail prepared for mailing at reduced postage rates." The preparation includes presorting and placing into containers by ZIP code.