What are the function of mail server?
A mail server (also known as a mail transfer agent or MTA, a
mail transport agent, a mail router or an Internet mailer) is an
application that receives incoming e-mail from local users (people
within the same domain) and remote senders and forwards outgoing
e-mail for delivery.
The mail server functions in conjunction with some other
programs to create up what exactly is occasionally known to as a
messaging system. A messaging system consists of all the programs
required to maintain e-mail moving as it ought to. Whenever you
send out an e-mail message, your own e-mail program, for example
Outlook or Eudora, forwards the message to your mail server, which
often forwards it either to another mail server or to a holding
area on the same server known as a message store to become
forwarded later. As a rule, the system uses SMTP (Simple Mail
Transfer Protocol) or ESMTP (extended SMTP) for sending e-mail, and
either POP3 (Post Office Protocol 3) or IMAP (Internet Message
Access Protocol) for receiving e-mail.