Benefits of Email are -

E-mail, in full electronic mail, messages transmitted and received by digital computers through a network.
Large corporations and institutions use e-mail systems as an important communication link between employees and other people allowed on their networks.
Email is also available on major public online and bulletin board systems, many of which maintain free or low-cost global communication networks.
Email reduces communication costs, ensures quick communication and keeps the record of the information.
Source: www.britannica.com