A connected IMAPStore maintains a pool of IMAP protocol objects for
use in communicating with the IMAP server. The IMAPStore will create
the initial AUTHENTICATED connection and seed the pool with this
connection. As folders are opened and new IMAP protocol objects are
needed, the IMAPStore will provide them from the connection pool,
or create them if none are available. When a folder is closed,
its IMAP protocol object is returned to the connection pool if the
pool is not over capacity.
A mechanism is provided for timing out idle connection pool IMAP
protocol objects. Timed out connections are closed and removed (pruned)
from the connection pool.
The connected IMAPStore object may or may not maintain a separate IMAP
protocol object that provides the store a dedicated connection to the
IMAP server. This is provided mainly for compatibility with previous
implementations of the IMAP protocol provider.
The IMAP protocol provider supports the following properties,
which may be set in the JavaMail Session object.
The properties are always set as strings; the Type column describes
how the string is interpreted. For example, use
| Name |
Type |
Description |
| mail.imap.user |
String |
Default user name for IMAP. |
| mail.imap.host |
String |
The IMAP server to connect to. |
| mail.imap.port |
int |
The IMAP server port to connect to, if the connect() method doesn't
explicitly specify one. Defaults to 143. |
| mail.imap.partialfetch |
boolean |
Controls whether the IMAP partial-fetch capability should be used.
Defaults to true. |
| mail.imap.fetchsize |
int |
Partial fetch size in bytes. Defaults to 16K. |
| mail.imap.connectiontimeout |
int |
Socket connection timeout value in milliseconds.
Default is infinite timeout. |
| mail.imap.timeout |
int |
Socket I/O timeout value in milliseconds. Default is infinite timeout. |
| mail.imap.statuscachetimeout |
int |
Timeout value in milliseconds for cache of STATUS command response.
Default is 1000 (1 second). Zero disables cache. |
| mail.imap.appendbuffersize |
int |
Maximum size of a message to buffer in memory when appending to an IMAP
folder. If not set, or set to -1, there is no maximum and all messages
are buffered. If set to 0, no messages are buffered. If set to (e.g.)
8192, messages of 8K bytes or less are buffered, larger messages are
not buffered. Buffering saves cpu time at the expense of short term
memory usage. If you commonly append very large messages to IMAP
mailboxes you might want to set this to a moderate value (1M or less).
|
| mail.imap.connectionpoolsize |
int |
Maximum number of available connections in the connection pool.
Default is 1. |
| mail.imap.connectionpooltimeout |
int |
Timeout value in milliseconds for connection pool connections. Default
is 45000 (45 seconds). |
| mail.imap.separatestoreconnection |
boolean |
Flag to indicate whether to use a dedicated store connection for store
commands. Default is false. |
| mail.imap.allowreadonlyselect |
boolean |
If false, attempts to open a folder read/write will fail
if the SELECT command succeeds but indicates that the folder is READ-ONLY.
This sometimes indicates that the folder contents can'tbe changed, but
the flags are per-user and can be changed, such as might be the case for
public shared folders. If true, such open attempts will succeed, allowing
the flags to be changed. The getMode method on the
Folder object will return Folder.READ_ONLY
in this case even though the open method specified
Folder.READ_WRITE. Default is false. |
| mail.imap.auth.login.disable |
boolean |
If true, prevents use of the non-standard AUTHENTICATE LOGIN
command, instead using the plain LOGIN command.
Default is false. |
| mail.imap.auth.plain.disable |
boolean |
If true, prevents use of the AUTHENTICATE PLAIN command.
Default is false. |
| mail.imap.proxyauth.user |
String |
If the server supports the PROXYAUTH extension, this property
specifies the name of the user to act as. Authenticate to the
server using the administrator's credentials. After authentication,
the IMAP provider will issue the PROXYAUTH command with
the user name specified in this property.
|
| mail.imap.starttls.enable |
boolean |
If true, enables the use of the STARTTLS command (if
supported by the server) to switch the connection to a TLS-protected
connection before issuing any login commands. Note that an appropriate
trust store must configured so that the client will trust the server's
certificate. This feature only works on J2SE 1.4 and newer systems.
Default is false. |
| mail.imap.localaddress |
String |
Local address (host name) to bind to when creating the IMAP socket.
Defaults to the address picked by the Socket class.
Should not normally need to be set, but useful with multi-homed hosts
where it's important to pick a particular local address to bind to.
|
| mail.imap.localport |
int |
Local port number to bind to when creating the IMAP socket.
Defaults to the port number picked by the Socket class.
|
| mail.imap.sasl.enable |
boolean |
If set to true, attempt to use the javax.security.sasl package to
choose an authentication mechanism for login.
Defaults to false.
|
| mail.imap.sasl.mechanisms |
String |
A space or comma separated list of SASL mechanism names to try
to use.
|
| mail.imap.sasl.authorizationid |
String |
The authorization ID to use in the SASL authentication.
If not set, the authentication ID (user name) is used.
|
| mail.smtp.sasl.realm |
String |
The realm to use with SASL authentication mechanisms that
require a realm, such as DIGEST-MD5. |
| mail.imap.socketFactory.class |
String |
If set, specifies the name of a class that implements the
javax.net.SocketFactory interface. This class
will be used to create IMAP sockets.
|
| mail.imap.socketFactory.fallback |
boolean |
If set to true, failure to create a socket using the specified
socket factory class will cause the socket to be created using
the java.net.Socket class.
Defaults to true.
|
| mail.imap.socketFactory.port |
int |
Specifies the port to connect to when using the specified socket
factory.
If not set, the default port will be used.
|
| mail.imap.ssl.protocols |
string |
Specifies the SSL protocols that will be enabled for SSL connections.
The property value is a whitespace separated list of tokens acceptable
to the javax.net.ssl.SSLSocket.setEnabledProtocols method.
|
| mail.imap.ssl.ciphersuites |
string |
Specifies the SSL cipher suites that will be enabled for SSL connections.
The property value is a whitespace separated list of tokens acceptable
to the javax.net.ssl.SSLSocket.setEnabledCipherSuites method.
|
| mail.imap.minidletime |
int |
Applications typically call the idle method in a loop. If another
thread termiantes the IDLE command, it needs a chance to do its
work before another IDLE command is issued. The idle method enforces
a delay to prevent thrashing between the IDLE command and regular
commands. This property sets the delay in milliseconds. If not
set, the default is 10 milliseconds.
|
| mail.imap.enableimapevents |
boolean |
Enable special IMAP-specific events to be delivered to the Store's
ConnectionListener. If true, unsolicited responses
received during the Store's idle method will be sent
as ConnectionEvents with a type of
IMAPStore.RESPONSE. The event's message will be the
raw IMAP response string.
By default, these events are not sent.
NOTE: This capability is highly experimental and likely will change
in future releases.
|
In general, applications should not need to use the classes in this
package directly. Instead, they should use the APIs defined by
javax.mail package (and subpackages). Applications should
never construct instances of IMAPStore or
IMAPFolder directly. Instead, they should use the
Session method getStore to acquire an
appropriate Store object, and from that acquire
Folder objects.