See: Description
Interface | Description |
---|---|
IMAPFolder.ProtocolCommand |
A simple interface for user-defined IMAP protocol commands.
|
Utility.Condition |
This interface defines the test to be executed in
toMessageSet() . |
Class | Description |
---|---|
ACL |
An access control list entry for a particular authentication identifier
(user or group).
|
AppendUID |
Information from the APPENDUID response code
defined by the UIDPLUS extension -
RFC 4315.
|
CopyUID |
Information from the COPYUID response code
defined by the UIDPLUS extension -
RFC 4315.
|
DefaultFolder |
The default IMAP folder (root of the naming hierarchy).
|
IdleManager |
IdleManager uses the optional IMAP IDLE command
(RFC 2177)
to watch multiple folders for new messages.
|
IMAPBodyPart |
An IMAP body part.
|
IMAPFolder |
This class implements an IMAP folder.
|
IMAPFolder.FetchProfileItem |
A fetch profile item for fetching headers.
|
IMAPInputStream |
This class implements an IMAP data stream.
|
IMAPMessage |
This class implements an IMAPMessage object.
|
IMAPMessage.FetchProfileCondition |
This class implements the test to be done on each
message in the folder.
|
IMAPMultipartDataSource |
This class
|
IMAPNestedMessage |
This class implements a nested IMAP message
|
IMAPProvider |
The IMAP protocol provider.
|
IMAPSSLProvider |
The IMAP SSL protocol provider.
|
IMAPSSLStore |
This class provides access to an IMAP message store over SSL.
|
IMAPStore |
This class provides access to an IMAP message store.
|
MessageCache |
A cache of IMAPMessage objects along with the
mapping from message number to IMAP sequence number.
|
MessageVanishedEvent |
This class provides notification of messages that have been removed
since the folder was last synchronized.
|
ModifiedSinceTerm |
Find messages that have been modified since a given MODSEQ value.
|
OlderTerm |
Find messages that are older than a given interval (in seconds).
|
ResyncData |
Resynchronization data as defined by the QRESYNC extension
(RFC 5162).
|
Rights |
The Rights class represents the set of rights for an authentication
identifier (for instance, a user or a group).
|
Rights.Right |
This inner class represents an individual right.
|
SortTerm |
A particular sort criteria, as defined by
RFC 5256.
|
Utility |
Holder for some static utility methods.
|
YoungerTerm |
Find messages that are younger than a given interval (in seconds).
|
Exception | Description |
---|---|
ReferralException |
A special kind of AuthenticationFailedException that indicates that
the reason for the failure was an IMAP REFERRAL in the response code.
|
An IMAP protocol provider for the JavaMail API
that provides access to an IMAP message store.
Both the IMAP4 and IMAP4rev1 protocols are supported.
Refer to
RFC 3501
for more information.
The IMAP protocol provider also supports many IMAP extensions (described below).
Note that the server needs to support these extensions (and not all servers do)
in order to use the support in the IMAP provider.
You can query the server for support of these extensions using the
IMAPStore hasCapability
method using the capability name defined by the extension
(see the appropriate RFC) after connecting to the server.
The IMAP UIDPLUS extension
(RFC 4315)
is supported via the IMAPFolder methods
addMessages
,
appendUIDMessages
, and
copyUIDMessages
.
The IMAP MOVE extension
(RFC 6851)
is supported via the IMAPFolder methods
moveMessages
and
moveUIDMessages
.
The IMAP protocol provider can use SASL
(RFC 4422)
authentication mechanisms on systems that support the
javax.security.sasl
APIs.
The SASL-IR
(RFC 4959)
capability is also supported.
In addition to the SASL mechanisms that are built into
the SASL implementation, users can also provide additional
SASL mechanisms of their own design to support custom authentication
schemes. See the
Java SASL API Programming and Deployment Guide for details.
Note that the current implementation doesn't support SASL mechanisms
that provide their own integrity or confidentiality layer.
Support for OAuth 2.0 authentication via the XOAUTH2 authentication mechanism is provided either through the SASL support described above or as a built-in authentication mechanism in the IMAP provider. The OAuth 2.0 Access Token should be passed as the password for this mechanism. See OAuth2 Support for details.
Connection PoolA 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.
QUOTA Support
The IMAP QUOTA extension
(RFC 2087)
is supported via the
QuotaAwareStore
interface implemented by
IMAPStore
, and the
IMAPFolder getQuota
and
IMAPFolder setQuota
methods.
ACL Support
The IMAP ACL extension
(RFC 2086)
is supported via the
Rights
class and the IMAPFolder methods
getACL
,
addACL
,
removeACL
,
addRights
,
removeRights
,
listRights
, and
myRights
.
The IMAP SORT extension
(RFC 5256)
is supported via the
SortTerm
class and the IMAPFolder
getSortedMessages
methods.
Basic support is provided for the IMAP CONDSTORE
(RFC 4551)
and QRESYNC
(RFC 5162)
extensions for the purpose of resynchronizing a folder after offline operation.
Of course, the server must support these extensions.
Use of these extensions is enabled by using the new
IMAPFolder open
method and supplying an appropriate
ResyncData
instance.
Using
ResyncData.CONDSTORE
enables the CONDSTORE extension, which allows you to discover the
modification sequence number (modseq) of messages using the
IMAPMessage getModSeq
method and the
IMAPFolder getHighestModSeq
method.
Using a
ResyncData
instance with appropriate
values also allows the server to report any changes in messages since the last
resynchronization.
The changes are reported as a list of
MailEvent
instances.
The special
MessageVanishedEvent
reports on
UIDs of messages that have been removed since the last resynchronization.
A
MessageChangedEvent
reports on
changes to flags of messages.
For example:
Folder folder = store.getFolder("whatever"); IMAPFolder ifolder = (IMAPFolder)folder; List<MailEvent> events = ifolder.open(Folder.READ_WRITE, new ResyncData(prevUidValidity, prevModSeq)); for (MailEvent ev : events) { if (ev instanceOf MessageChangedEvent) { // process flag changes } else if (ev instanceof MessageVanishedEvent) { // process messages that were removed } }
See the referenced RFCs for more details on these IMAP extensions.
WITHIN Search Support
The IMAP WITHIN search extension
(RFC 5032)
is supported via the
YoungerTerm
and
OlderTerm
SearchTerms
, which can be used as follows:
// search for messages delivered in the last day Message[] msgs = folder.search(new YoungerTerm(24 * 60 * 60));LOGIN-REFERRAL Support
The IMAP LOGIN-REFERRAL extension
(RFC 2221)
is supported.
If a login referral is received when connecting or when authentication fails, a
ReferralException
is thrown.
A referral can also occur when login succeeds. By default, no exception is
thrown in this case. To force an exception to be thrown and the authentication
to fail, set the mail.imap.referralexception
property to "true".
The IMAP COMPRESS extension
(RFC 4978)
is supported.
If the server supports the extension and the
mail.imap.compress.enable
property is set to "true",
compression will be enabled.
The IMAP UTF8 extension (RFC 6855) is supported. If the server supports the extension, the client will enable use of UTF-8, allowing use of UTF-8 in IMAP protocol strings such as folder names.
Properties
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
props.put("mail.imap.port", "888");
to set the mail.imap.port
property, which is of type int.
Note that if you're using the "imaps" protocol to access IMAP over SSL, all the properties would be named "mail.imaps.*".
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.peek | boolean |
If set to true, use the IMAP PEEK option when fetching body parts,
to avoid setting the SEEN flag on messages.
Defaults to false.
Can be overridden on a per-message basis by the
setPeek
method on IMAPMessage.
|
mail.imap.ignorebodystructuresize | boolean | The IMAP BODYSTRUCTURE response includes the exact size of each body part. Normally, this size is used to determine how much data to fetch for each body part. Some servers report this size incorrectly in some cases; this property can be set to work around such server bugs. If this property is set to true, this size is ignored and data is fetched until the server reports the end of data. This will result in an extra fetch if the data size is a multiple of the block size. Defaults to false. |
mail.imap.connectiontimeout | int | Socket connection timeout value in milliseconds. This timeout is implemented by java.net.Socket. Default is infinite timeout. |
mail.imap.timeout | int | Socket read timeout value in milliseconds. This timeout is implemented by java.net.Socket. Default is infinite timeout. |
mail.imap.writetimeout | int | Socket write timeout value in milliseconds. This timeout is implemented by using a java.util.concurrent.ScheduledExecutorService per connection that schedules a thread to close the socket if the timeout expires. Thus, the overhead of using this timeout is one thread per connection. 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.mechanisms | String |
If set, lists the authentication mechanisms to consider, and the order
in which to consider them. Only mechanisms supported by the server and
supported by the current implementation will be used.
The default is "PLAIN LOGIN NTLM" , which includes all
the authentication mechanisms supported by the current implementation
except XOAUTH2.
|
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.auth.ntlm.disable | boolean | If true, prevents use of the AUTHENTICATE NTLM command.
Default is false. |
mail.imap.auth.ntlm.domain | String | The NTLM authentication domain. |
mail.imap.auth.ntlm.flags | int | NTLM protocol-specific flags. See http://curl.haxx.se/rfc/ntlm.html#theNtlmFlags for details. |
mail.imap.auth.xoauth2.disable | boolean | If true, prevents use of the AUTHENTICATE XOAUTH2 command.
Because the OAuth 2.0 protocol requires a special access token instead of
a password, this mechanism is disabled by default. Enable it by explicitly
setting this property to "false" or by setting the "mail.imap.auth.mechanisms"
property to "XOAUTH2". |
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.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.imap.sasl.realm | String | The realm to use with SASL authentication mechanisms that require a realm, such as DIGEST-MD5. |
mail.imap.sasl.usecanonicalhostname | boolean |
If set to true, the canonical host name returned by
InetAddress.getCanonicalHostName
is passed to the SASL mechanism, instead of the host name used to connect.
Defaults to false.
|
mail.imap.sasl. xgwtrustedapphack.enable | boolean | If set to true, enables a workaround for a bug in the Novell Groupwise XGWTRUSTEDAPP SASL mechanism, when that mechanism is being used. Defaults to true. |
mail.imap.socketFactory | SocketFactory |
If set to a class that implements the
javax.net.SocketFactory interface, this class
will be used to create IMAP sockets. Note that this is an
instance of a class, not a name, and must be set using the
put method, not the setProperty method.
|
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.usesocketchannels | boolean | If set to true, use SocketChannels instead of Sockets for connecting to the server. Required if using the IdleManager. Ignored if a socket factory is set. Defaults to false. |
mail.imap.ssl.enable | boolean | If set to true, use SSL to connect and use the SSL port by default. Defaults to false for the "imap" protocol and true for the "imaps" protocol. |
mail.imap.ssl.checkserveridentity | boolean | If set to true, check the server identity as specified by RFC 2595. These additional checks based on the content of the server's certificate are intended to prevent man-in-the-middle attacks. Defaults to false. |
mail.imap.ssl.trust | String |
If set, and a socket factory hasn't been specified, enables use of a
MailSSLSocketFactory .
If set to "*", all hosts are trusted.
If set to a whitespace separated list of hosts, those hosts are trusted.
Otherwise, trust depends on the certificate the server presents.
|
mail.imap.ssl.socketFactory | SSLSocketFactory |
If set to a class that extends the
javax.net.ssl.SSLSocketFactory class, this class
will be used to create IMAP SSL sockets. Note that this is an
instance of a class, not a name, and must be set using the
put method, not the setProperty method.
|
mail.imap.ssl.socketFactory.class | String |
If set, specifies the name of a class that extends the
javax.net.ssl.SSLSocketFactory class. This class
will be used to create IMAP SSL sockets.
|
mail.imap.ssl.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.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.
If the server does not support STARTTLS, the connection continues without
the use of TLS; see the
mail.imap.starttls.required
property to fail if STARTTLS isn't supported.
Note that an appropriate trust store must configured so that the client
will trust the server's certificate.
Default is false. |
mail.imap.starttls.required | boolean |
If true, requires the use of the STARTTLS command.
If the server doesn't support the STARTTLS command, or the command
fails, the connect method will fail.
Defaults to false.
|
mail.imap.proxy.host | string | Specifies the host name of an HTTP web proxy server that will be used for connections to the mail server. |
mail.imap.proxy.port | string | Specifies the port number for the HTTP web proxy server. Defaults to port 80. |
mail.imap.proxy.user | string | Specifies the user name to use to authenticate with the HTTP web proxy server. By default, no authentication is done. |
mail.imap.proxy.password | string | Specifies the password to use to authenticate with the HTTP web proxy server. By default, no authentication is done. |
mail.imap.socks.host | string | Specifies the host name of a SOCKS5 proxy server that will be used for connections to the mail server. |
mail.imap.socks.port | string | Specifies the port number for the SOCKS5 proxy server. This should only need to be used if the proxy server is not using the standard port number of 1080. |
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.enableresponseevents | boolean |
Enable special IMAP-specific events to be delivered to the Store's
ConnectionListener . If true, IMAP OK, NO, BAD, or BYE responses
will be sent as ConnectionEvent s 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.
|
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 ConnectionEvent s 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.
|
mail.imap.throwsearchexception | boolean |
If set to true and a SearchTerm
passed to the
Folder.search
method is too complex for the IMAP protocol, throw a
SearchException .
For example, the IMAP protocol only supports less-than and greater-than
comparisons for a SizeTerm .
If false, the search will be done locally by fetching the required
message data and comparing it locally.
Defaults to false.
|
mail.imap.folder.class | String |
Class name of a subclass of com.sun.mail.imap.IMAPFolder .
The subclass can be used to provide support for additional IMAP commands.
The subclass must have public constructors of the form
public MyIMAPFolder(String fullName, char separator, IMAPStore store,
Boolean isNamespace) and
public MyIMAPFolder(ListInfo li, IMAPStore store)
|
mail.imap.closefoldersonstorefailure | boolean | In some cases, a failure of the Store connection indicates a failure of the server, and all Folders associated with that Store should also be closed. In other cases, a Store connection failure may be a transient failure, and Folders may continue to operate normally. If this property is true (the default), failures in the Store connection cause all associated Folders to be closed. Set this property to false to better handle transient failures in the Store connection. |
mail.imap.finalizecleanclose | boolean | When the finalizer for IMAPStore is called, should the connection to the server be closed cleanly, as if the application called the close method? Or should the connection to the server be closed without sending any commands to the server? Defaults to false, the connection is not closed cleanly. |
mail.imap.referralexception | boolean |
If set to true and an IMAP login referral is returned when the authentication
succeeds, fail the connect request and throw a
ReferralException .
Defaults to false.
|
mail.imap.compress.enable | boolean | If set to true and the IMAP server supports the COMPRESS=DEFLATE extension, compression will be enabled. Defaults to false. |
mail.imap.compress.level | int |
The compression level to be used, in the range -1 to 9.
See the Deflater class for details.
|
mail.imap.compress.strategy | int |
The compression strategy to be used, in the range 0 to 2.
See the Deflater class for details.
|
mail.imap.compress.strategy | boolean | If true, always use "A" for the IMAP command tag prefix. If false, the IMAP command tag prefix is different for each connection, from "A" through "ZZZ" and then wrapping around to "A". Applications should never need to set this. Defaults to false. |
In general, applications should not need to use the classes in this
package directly. Instead, they should use the APIs defined by the
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.
In addition to printing debugging output as controlled by the
Session
configuration,
the com.sun.mail.imap provider logs the same information using
Logger
as described in the following table:
Logger Name | Logging Level | Purpose |
---|---|---|
com.sun.mail.imap | CONFIG | Configuration of the IMAPStore |
com.sun.mail.imap | FINE | General debugging output |
com.sun.mail.imap.connectionpool | CONFIG | Configuration of the IMAP connection pool |
com.sun.mail.imap.connectionpool | FINE | Debugging output related to the IMAP connection pool |
com.sun.mail.imap.messagecache | CONFIG | Configuration of the IMAP message cache |
com.sun.mail.imap.messagecache | FINE | Debugging output related to the IMAP message cache |
com.sun.mail.imap.protocol | FINEST | Complete protocol trace |
WARNING: The APIs unique to this package should be considered EXPERIMENTAL. They may be changed in the future in ways that are incompatible with applications using the current APIs.
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