# phpman > man > Mail::Box::Maildir

## NAME
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown) - handle Maildir folders

## INHERITANCE
     [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)
       is a [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown)
       is a [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)
       is a [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

## SYNOPSIS
     use [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown);
     my $folder = new [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown) folder => $ENV{MAIL}, ...;

## DESCRIPTION
    This documentation describes how Maildir mailboxes work, and what you can do with the Maildir
    folder object "[Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)".

    Maildir is not supported for Windows, because it create filenames which are not accepted by the
    Windows system.

    Extends "DESCRIPTION" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

## OVERLOADED
    Extends "OVERLOADED" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    overload: ""
        Inherited, see "OVERLOADED" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    overload: @{}
        Inherited, see "OVERLOADED" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    overload: cmp
        Inherited, see "OVERLOADED" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

## METHODS
    Extends "METHODS" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

### Constructors
    Extends "Constructors" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->new(%options)
         -Option           --Defined in     --Default
          accept_new                          <false>
          access             [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        'r'
          body_delayed_type  [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        [Mail::Message::Body::Delayed](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3ABody%3A%3ADelayed/markdown)
          body_type          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        [Mail::Message::Body::Lines](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3ABody%3A%3ALines/markdown)
          coerce_options     [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        []
          create             [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <false>
          directory          [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown)   <derived from folder name>
          extract            [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        10240
          field_type         [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        undef
          fix_headers        [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <false>
          folder             [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        $ENV{MAIL}
          folderdir          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        $ENV{HOME}/.maildir
          head_delayed_type  [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        [Mail::Message::Head::Delayed](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AHead%3A%3ADelayed/markdown)
          head_type          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        [Mail::Message::Head::Complete](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AHead%3A%3AComplete/markdown)
          keep_dups          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <false>
          lock_file          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <not used>
          lock_timeout       [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <not used>
          lock_type          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        'NONE' (constant)
          lock_wait          [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <not used>
          locker             [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        undef
          log                [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)   'WARNINGS'
          manager            [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        undef
          message_type       [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <folder-class>::Message
          multipart_type     [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        [Mail::Message::Body::Multipart](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3ABody%3A%3AMultipart/markdown)
          remove_when_empty  [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <true>
          save_on_exit       [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <true>
          trace              [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)   'WARNINGS'
          trusted            [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)        <depends on folder location>

        accept_new => BOOLEAN
          When the folder is open, some messages may be stored in the "new" sub-directory. By
          default, these messages are immediately moved to the "cur" directory when the folder is
          opened. Otherwise, you have to call acceptMessages() or
          [Mail::Box::Maildir::Message::accept](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir%3A%3AMessage%3A%3Aaccept/markdown)().

        access => MODE
        body_delayed_type => CLASS
        body_type => CLASS|CODE
        coerce_options => ARRAY
        create => BOOLEAN
        directory => DIRECTORY
        extract => INTEGER | CODE | METHOD | 'LAZY'|'ALWAYS'
        field_type => CLASS
        fix_headers => BOOLEAN
        folder => FOLDERNAME
        folderdir => DIRECTORY
        head_delayed_type => CLASS
        head_type => CLASS
        keep_dups => BOOLEAN
        lock_file => FILENAME
        lock_timeout => SECONDS
        lock_type => CLASS|STRING|ARRAY
        lock_wait => SECONDS
        locker => OBJECT
        log => LEVEL
        manager => MANAGER
        message_type => CLASS
        multipart_type => CLASS
        remove_when_empty => BOOLEAN
        save_on_exit => BOOLEAN
        trace => LEVEL
        trusted => BOOLEAN

### The folder
    Extends "The folder" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->addMessage($message, %options)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->addMessages(@messages)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->appendMessages(%options)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->close(%options)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->copyTo($folder, %options)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->delete(%options)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->directory()
        Inherited, see "The folder" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown)

    $obj->folderdir( [$directory] )
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->name()
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->organization()
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->size()
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->type()
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->update(%options)
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->url()
        Inherited, see "The folder" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

### Folder flags
    Extends "Folder flags" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->access()
        Inherited, see "Folder flags" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->isModified()
        Inherited, see "Folder flags" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->modified( [BOOLEAN] )
        Inherited, see "Folder flags" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->writable()
        Inherited, see "Folder flags" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

### The messages
    Extends "The messages" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->current( [$number|$message|$message_id] )
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->find($message_id)
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->findFirstLabeled( $label, [BOOLEAN, [$msgs]] )
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->message( $index, [$message] )
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->messageId( $message_id, [$message] )
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->messageIds()
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->messages( <'ALL'|$range|'ACTIVE'|'DELETED'|$label| !$label|$filter> )
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->nrMessages(%options)
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->scanForMessages($message, $message_ids, $timespan, $window)
        Inherited, see "The messages" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

### Sub-folders
    Extends "Sub-folders" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->listSubFolders(%options)
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->listSubFolders(%options)
        Inherited, see "Sub-folders" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->nameOfSubFolder( $subname, [$parentname] )
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->nameOfSubFolder( $subname, [$parentname] )
        Inherited, see "Sub-folders" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->openRelatedFolder(%options)
        Inherited, see "Sub-folders" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->openSubFolder($subname, %options)
        Inherited, see "Sub-folders" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->topFolderWithMessages()
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->topFolderWithMessages()
        Inherited, see "Sub-folders" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

### Internals
    Extends "Internals" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->acceptMessages()
        Accept all messages which are waiting in the "new" directory to be moved to the "cur"
        directory. This will not rescan the directory for newly arrived messages, because that's a
        task for update().

    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->appendMessage(%options)
    $obj->coerce($message, %options)
    $obj->create($foldername, %options)
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->create($foldername, %options)
         -Option   --Defined in--Default
          folderdir  [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)   undef

        folderdir => DIRECTORY

    $obj->createDirs($folderdir)
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->createDirs($folderdir)
        The $folderdir contains the absolute path of the location where the messages are kept.
        Maildir folders contain a "tmp", "new", and "cur" sub-directory within that folder directory
        as well. This method will ensure that all directories exist. Returns false on failure.

    $obj->determineBodyType($message, $head)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->folderIsEmpty($folderdir)
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->folderIsEmpty($folderdir)
        Checks whether the folder whose directory is specified as absolute $folderdir is empty or
        not. A folder is empty when the "tmp", "new", and "cur" subdirectories are empty and some
        files which are left there by application programs. The maildir spec explicitly states:
        ".qmail", "bulletintime", "bulletinlock" and "seriallock". If any other files are found, the
        directory is considered not-empty.

    $obj->folderToDirectory($foldername, $folderdir)
        Inherited, see "Internals" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown)

    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->foundIn( [$foldername], %options )
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->lineSeparator( [<STRING|'CR'|'LF'|'CRLF'>] )
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->locker()
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->messageInFile($filename)
        Inherited, see "Internals" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown)

    $obj->read(%options)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->readMessageFilenames($directory)
        Inherited, see "Internals" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown)

    $obj->readMessages(%options)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->storeMessage($message)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->toBeThreaded($messages)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->toBeUnthreaded($messages)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->updateMessages(%options)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->write(%options)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

    $obj->writeMessages(%options)
        Inherited, see "Internals" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

### Other methods
    Extends "Other methods" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->timespan2seconds($time)
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->timespan2seconds($time)
        Inherited, see "Other methods" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

### Error handling
    Extends "Error handling" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->AUTOLOAD()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->addReport($object)
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->errors()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->log( [$level, [$strings]] )
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->log( [$level, [$strings]] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->logPriority($level)
    [Mail::Box::Maildir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AMaildir/markdown)->logPriority($level)
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->logSettings()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->notImplemented()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->report( [$level] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->reportAll( [$level] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->trace( [$level] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->warnings()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

### Cleanup
    Extends "Cleanup" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

    $obj->DESTROY()
        Inherited, see "Cleanup" in [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)

## DETAILS
    The explanation is complicated, but for normal use you should bother yourself with all details.

    Extends "DETAILS" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

### Different kinds of folders
    Extends "Different kinds of folders" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

### Available folder types
    Extends "Available folder types" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

### Folder class implementation
    Extends "Folder class implementation" in [Mail::Box::Dir](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3ADir/markdown).

### How MAILDIR folders work
    Maildir-type folders use a directory to store the messages of one folder. Each message is stored
    in a separate file. This seems useful, because changes in a folder change only a few of these
    small files, in contrast with file-based folders where changes in a folder cause rewrites of
    huge folder-files.

    However, Maildir based folders perform very bad if you need header information of all messages.
    For instance, if you want to have full knowledge about all message-threads (see
    [Mail::Box::Thread::Manager](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox%3A%3AThread%3A%3AManager/markdown)) in the folder, it requires to read all header lines in all message
    files. And usually, reading your messages as threads is desired. Maildir maintains a tiny amount
    of info visible in the filename, which may make it perform just a little bit faster than MH.

## DIAGNOSTICS
    Error: Cannot append Maildir message in $new to folder $self.
        The message (or messages) could not be stored in the right directories for the Maildir
        folder.

    Error: Cannot create Maildir directory $dir: $!
        A Maildir folder is represented by a directory, with some sub-directories. The top folder
        directory could not be created for the reason indicated.

    Error: Cannot create Maildir folder $name.
        One or more of the directories required to administer a Maildir folder could not be created.

    Error: Cannot create Maildir message file $new.
        A message is converted from some other message format into a Maildir format by writing it to
        a file with a name which contains the status flags of the message. Apparently, creating this
        file failed.

    Error: Cannot create Maildir subdir $dir: $!
        Each Maildir folder has three sub-directories for administration: "new", "tmp", and "cur".
        The mentioned directory could not be created for the indicated reason.

    Warning: Changes not written to read-only folder $self.
        You have opened the folder read-only --which is the default set by new(access)--, made
        modifications, and now want to close it. Set close(force) if you want to overrule the access
        mode, or close the folder with close(write) set to "NEVER".

    Error: Copying failed for one message.
        For some reason, for instance disc full, removed by external process, or read-protection, it
        is impossible to copy one of the messages. Copying will proceed for the other messages.

    Error: Destination folder $name is not writable.
        The folder where the messages are copied to is not opened with write access (see
        new(access)). This has no relation with write permission to the folder which is controlled
        by your operating system.

    Warning: Different messages with id $msgid
        The message id is discovered more than once within the same folder, but the content of the
        message seems to be different. This should not be possible: each message must be unique.

    Error: Folder $name is opened read-only
        You can not write to this folder unless you have opened the folder to write or append with
        new(access), or the "force" option is set true.

    Error: Folder $name not deleted: not writable.
        The folder must be opened with write access via new(access), otherwise removing it will be
        refused. So, you may have write-access according to the operating system, but that will not
        automatically mean that this "delete" method permits you to. The reverse remark is valid as
        well.

    Error: Invalid timespan '$timespan' specified.
        The string does not follow the strict rules of the time span syntax which is permitted as
        parameter.

    Warning: Message-id '$msgid' does not contain a domain.
        According to the RFCs, message-ids need to contain a unique random part, then an "@", and
        then a domain name. This is made to avoid the creation of two messages with the same id. The
        warning emerges when the "@" is missing from the string.

    Error: Package $package does not implement $method.
        Fatal error: the specific package (or one of its superclasses) does not implement this
        method where it should. This message means that some other related classes do implement this
        method however the class at hand does not. Probably you should investigate this and probably
        inform the author of the package.

    Error: Unable to create subfolder $name of $folder.
        The copy includes the subfolders, but for some reason it was not possible to copy one of
        these. Copying will proceed for all other sub-folders.

    Error: Writing folder $name failed
        For some reason (you probably got more error messages about this problem) it is impossible
        to write the folder, although you should because there were changes made.

## SEE ALSO
    This module is part of Mail-Box distribution version 3.009, built on August 18, 2020. Website:
    <http://perl.overmeer.net/CPAN/>

## LICENSE
    Copyrights 2001-2020 by [Mark Overmeer]. For other contributors see ChangeLog.

    This program is free software; you can redistribute it and/or modify it under the same terms as
    Perl itself. See <http://dev.perl.org/licenses/>