S-mail, short for snail mail, refers to traditional postal mail sent via the postal service. It is the opposite of e-mail, which is sent electronically. While s-mail may seem outdated in today's digital age, it is still a vital communication tool for many people and businesses. Some synonyms for s-mail include post, mail, correspondence, letters, and parcels. Other words that can be used to describe the process of sending s-mail include mailing, posting, and dispatching. These words may be useful in a variety of contexts, such as letter writing, invoicing, or sending packages. Despite the rise of digital communication, s-mail remains an important part of our daily lives.