Mail-Api

The JavaMail is an API that is used to compose, write
and read electronic messages. The JavaMail API
provides protocol-independent and plateformindependent
framework for sending and receiving mails.
The javax.mail and javax.mail.activation packages
contains the core classes of JavaMail API.
The JavaMail facility can be applied to many events. It
can be used at the time of registering the user
(sending notification such as thanks for your interest to
my site), forgot password (sending password to the
users email id), sending notifications for important
updates etc. So there can be various usage of java
mail api.


SMTP

SMTP is an acronym for Simple Mail Transfer Protocol. It provides a mechanism to deliver the email. We can
use Apache James server, Postcast server, cmail server etc. as an SMTP server. But if we purchase the host
space, an SMTP server is bydefault provided by the host provider. For example, my smtp server is
mail.javatpoint.com. If we use the SMTP server provided by the host provider, authentication is required for
sending and receiving emails.

POP

POP is an acronym for Post Office Protocol, also known as POP3. It provides a mechanism to receive the
email. It provides support for single mail box for each user. We can use Apache James server, cmail server
etc. as an POP server. But if we purchase the host space, an POP server is bydefault provided by the host
provider. For example, the pop server provided by the host prvider for my site is mail.javatpoint.com. This
protocol is defined in RFC 1939.

IMAP

IMAP is an acronym for Internet Message Access Protocol. IMAP is an advanced protocol for receiving
messages. It provides support for multiple mail box for each user ,in addition to, mailbox can be shared by
multiple users. It is defined in RFC 2060.

MIME

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POP3/SMTP Mail Server

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MIME

Multiple Internet Mail Extension (MIME) tells the browser what is being sent e.g. attachment, format of the
messages etc. It is not known as mail transfer protocol but it is used by your mail program.

NNTP and Others
There are many protocols that are provided by third-party providers. Some of them are Network News
Transfer Protocol (NNTP), Secure Multipurpose Internet Mail Extensions (S/MIME) etc.

JavaMail Architecture

The java application uses JavaMail API to compose, send and receive emails. The JavaMail API uses SPI
(Service Provider Interfaces) that provides the intermediatory services to the java application to deal with
the different protocols. Let's understand it with the figure given below:


JavaMail API Core Classes

There are two packages that are used in Java Mail API: javax.mail and javax.mail.internet package. These
packages contains many classes for Java Mail API. They are:
javax.mail.Session class
javax.mail.Message class
javax.mail.internet.MimeMessage class
javax.mail.Address class
javax.mail.internet.InternetAddress class
javax.mail.Authenticator class
javax.mail.PasswordAuthentication class
javax.mail.Transport class
javax.mail.Store class
javax.mail.Folder class etc.