Description
JavaMail API is the concept related to email through the JavaMail. By using JavaMail API, sending, receiving, deleting, managing the email. JavaMail API is a platform, protocol independent framework for to send or receive mail. JavaMail API also provides core classes for to define objects and used that objects to maintain a mail system. Here are some JavaMail Protocols which support the JavaMail API, they are as follows.
- JavaMail – SMTP
- JavaMail – IMAP
- JavaMail – POP3
Conceptual
figure
Let us see the implementation of JavaMail Protocols in JavaMail API.
Description
SMTP: It is an acronym for the “Simple Mail Transfer Protocol”, which issues a instrument to deliver the electronic mail(Email). An authentication is required in case of sending and receiving the emails through SMTP server which was provided by host server. An SMTP server also uses the Postcast server, ApacheJames server.
To get SMTP server: The SMTP server is responsible for sending the emails, SMTP server provided by different servers like
- Host provider provides SMTP server
- ApacheJames server provides SMTP server
- Yahoo, Gmail companies provides the SMTP server
- Free SMTP server provided by jangoSMTP
These are the providers to use any one SMTP sever in our application. com.sun.mail.smtp provides SMTP protocol for to access SMTP server.
Table
| Class | Description |
|---|---|
| SMTPMessage | It represents the MineMessage class which provides alll the parameters for sending a message. |
| SMTPSSLTransport | By using SMTP SMTPSSLTransport implements the abstract transport class over SSL for transport and submission of message. |
| SMTPTransport | By using SMTP SMTPSSLTransport implements the abstract transport class for transport and submission of message. |
Table
The exceptions occurs in case of SMTP server
| Exception | Description |
|---|---|
| SMTPAddressFailedException | when message sent failed then this exception occurs. |
| SMTPAddressSucceededException | when mail.smtp.reportsuccess property shows true, then SMTPAddressSucceededException is chained off SendFailed Exception. |
| SMTPSenderFailedException | when message sent failed then this exception occurs. |
| SMTPSendFailedException | when message sent failed then this exception occurs.and includes senders address |
Table
In the table listed below shows the properties of SMTP protocol that are set in session object in JavaMail API.
| Type | Description |
|---|---|
| mail.smtp.user | It represents the SMTP username which is default. |
| mail.smtp.port | It represents the port number of SMTP to connect too. |
| mail.smtp.timeout | It represents the IO socket time out value. |
| mail.smtp.socketFactory | The function of this class is to create SMTP sockects which implements javax.net.SocketFactory interface. |
| mail.smtp.socks.port | It represents the socket port number of socks5 proxy server only if proxy server port number 1080 is not used. |
| mail.smtp.localaddress | The local address represents the host name when creating SMTP socket and it is not mandatory to set by default socket class picks the address. |
| mail.smtp.auth.ntlm.flags | NTML protocol represented flags. |
| mail.smtp.mailextension | Which makes the extension string for to append to mail command. |
| mail.smtp.host | Represents the SMTP server to connect. |
Here in this package usage of class directly in application is not possible instead of that uses API defined by the javax.mail package
Description
IMAP: It is an acronym for the “Internet Message Access Protocol”. It is an advanced one to receive the messages. For each user IMAP supports the multiple mail box and by multiple users the mail box shared. IMAP is defined in RFC 2060. It’s have the feature to support both in offline and online operational modes. com.sun.mail.imap provides IMAP protocol for to access IMAP server.
The IMAP protocol supplies access to IMAP message store and there are some IMAP extensions for supporting that have to query the server. The IMAP extensions are
- UIDPLUS Support(RFC 4315)
- MOVE Support(RFC 6851)
- SASL Support(RFC 4422)
The IMAP store maintains a connection pool having IMAP objects for communicating with server.
Table
| Class | Description |
|---|---|
| ACL | It represents the access control list for entry for specific identifiers and it is a class. |
| IMAPFolder | It is a class and used to represent the IMAPFolder. |
| IMAPFolder.ProtocolCommand | It represents user-defined IMAP protocol command. |
| IMAPMessage | It represents a class and specifies ReadbleMine object. |
| IMAPStore | It represents a class and provides access to message store. |
| IMAPSSLStore | It represents a class and provides access to message store over SSL. |
| Rights | It represents rights for authentication identifier. |
| sortTerm | It is related to sort which was defined by RFC 5256. |
| IMAPFolder.FetchProfileItem | It represents a class for fetching headers. |
Table
The exceptions occurs in case of IMAP server
| Exception | Description |
|---|---|
| ReferralException | It represents, in response code the failure of IMAP Referral indicates the AuthenticationFailedException . |
Table
In the table listed below shows the properties of IMAP protocol that are set in session object in JavaMail API.
| Type | Description |
|---|---|
| mail.imap.user | It represents the IMAP username which is default. |
| mail.imap.port | It represents the port number of IMAP to connect too. |
| mail.imap.timeout | It represents the IO socket time out value. |
| mail.imap.socketFactory | The function of this class is to create IMAP sockects which implements javax.net.SocketFactory interface. |
| mail.imap.socks.port | It represents the socket port number of socks5 proxy server only if proxy server port number 1080 is not used. |
| mail.imap.localaddress | The local address represents the host name when creating IMAP socket and it is not mandatory to set by default socket class picks the address. |
| mail.imap.auth.ntlm.flags | NTML protocol represented flags. |
| mail.imap.mailextension | Which makes the extension string for to append to mail command. |
| mail.imap.host | Represents the IMAP server to connect. |
Here in this package usage of class directly in application is not possible instead of that uses API defined by the javax.mail package and also creating instance of IMAPStore, IMAPFolder is not possible directly with application for that have session method getStore.
Description
POP: It is an acronym for the “Post Office Protocol”, Which supports to receive the email. For each user POP supports the single mail box. POP is defined by RFC 1939. com.sun.mail.pop3 provides POP3 protocol for to access POP3 server. The server listens as port 110.
Table
| Name | Description |
|---|---|
| POP3Folder | The folder should be INBOX. |
| POP3Message | It represents POP3 message. |
| POP3SSLStore | It represents POP3 message over SSL. |
| POP3Store | It represents POP3 message store. |
Table
In the table listed below shows the properties of POP3 protocol that are set in session object in JavaMail API.
| Type | Description |
|---|---|
| mail.pop3.user | It represents the POP3 username which is default. |
| mail.pop3.port | It represents the port number of POP3 to connect too. |
| mail.pop3.timeout | It represents the IO socket time out value. |
| mail.pop3.socketFactory | The function of this class is to create POP3 sockects which implements javax.net.SocketFactory interface. |
| mail.pop3.socks.port | It represents the socket port number of socks5 proxy server only if proxy server port number 1080 is not used. |
| mail.pop3.localaddress | The local address represents the host name when creating POP3 socket and it is not mandatory to set by default socket class picks the address. |
| mail.pop3.ssl.enable | Set as true for default use of ssl but defaults to false. |
| mail.pop3.ssl.checkserveridentity | By default it is false, when set to true then check the identity of server represented by RFC 2595. |
| mail.pop3.host | Represents the POP3 server to connect. |
Here in this package usage of class directly in application is not possible instead of that uses API defined by the javax.mail package nd also creating instance of POP3Store, POP3Folder is not possible directly with application for that have session method getStore.
Key Points
- JavaMail Protocols – SMTP which issues a instrument to deliver the electronic mail(Email).
- JavaMail Protocols – Host provider provides SMTP server.
- JavaMail Protocols – com.sun.mail.smtp provides SMTP protocol for to access SMTP server.
- IMAP is an advanced one to receive the messages.
- com.sun.mail.imap provides IMAP protocol for to access IMAP server.
- It’s have the feature to support both in offline and online operational modes.
- POP server which supports to receive the email.
- com.sun.mail.pop3 provides POP3 protocol for to access POP3 server.
- Properties of SMTP, IMAP, POP3 protocols are discussed.