The email server is computer within your network that functions as your virtual post office where it receives incoming e-mail from local users and remote senders and forwards outgoing e-mail for delivery.
4 areas of the server:
The mail server works side by side with other programs to make up what is known as a messaging system which includes all the applications necessary to keep e-mail moving as it should. When an e-mail message is sent, the e-mail program such as Outlook or Eudora, will forwards the message to the mail server, which subsequently forwards it either to another mail server or to a holding area on the same server called a message store to be forwarded later.
SNS Network (ICT) provides professional mail server services as to enable clients to manage their e-mails application and server in a much easier and efficient, reduces complexity in handle their email applications.