Mail::Message::Body::Nested(3)

NAME
Mail::Message::Body::Nested - body of a message which contains a message

INHERITANCE
 Mail::Message::Body::Nested
   is a Mail::Message::Body
   is a Mail::Reporter

SYNOPSIS
 See Mail::Message::Body

 if($body->isNested) {
    my $nest = $body->nested;
    $nest->delete;
 }

DESCRIPTION
The body (content) of a message can be stored in various ways. In this manual-page you find the description of extra functionality you have when a message contains a nested message, like "message/rfc822".

A nested message is different from a multipart message which contains only one element, because a nested message has a full set of message header fields defined by the RFC882, where a part of a multipart has only a few. But because we do not keep track whether all fields are presented, a "Mail::Message::Part" is used anyway.

WARNING: Since 2023, at least outlook started to interpret RFC6533 incorrectly. Bodies of type 'message/rfc822' can only be 'nested', but when they (illegally) have Content-Transfer-Encoding, they can now behave like normal message parts (the same as a pdf or image).

Extends "DESCRIPTION" in Mail::Message::Body.

OVERLOADED
Extends "OVERLOADED" in Mail::Message::Body.

overload: ""
    Inherited, see "OVERLOADED" in Mail::Message::Body

overload: '==' and '!='
    Inherited, see "OVERLOADED" in Mail::Message::Body

overload: @{}
    Inherited, see "OVERLOADED" in Mail::Message::Body

overload: bool
    Inherited, see "OVERLOADED" in Mail::Message::Body

METHODS
Extends "METHODS" in Mail::Message::Body.

  Constructors
Extends "Constructors" in Mail::Message::Body.

$obj->clone()
    Inherited, see "Constructors" in Mail::Message::Body

Mail::Message::Body::Nested->new(%options)
     -Option           --Defined in         --Default
      based_on           Mail::Message::Body  undef
      charset            Mail::Message::Body  'PERL'
      checked            Mail::Message::Body  <false>
      content_id         Mail::Message::Body  undef
      data               Mail::Message::Body  undef
      description        Mail::Message::Body  undef
      disposition        Mail::Message::Body  undef
      eol                Mail::Message::Body  'NATIVE'
      file               Mail::Message::Body  undef
      filename           Mail::Message::Body  undef
      language           Mail::Message::Body  undef
      log                Mail::Reporter       'WARNINGS'
      message            Mail::Message::Body  undef
      mime_type          Mail::Message::Body  'message/rfc822'
      modified           Mail::Message::Body  <false>
      nested                                  undef
      trace              Mail::Reporter       'WARNINGS'
      transfer_encoding  Mail::Message::Body  'none'

    based_on => BODY
    charset => CHARSET|'PERL'|<undef>
    checked => BOOLEAN
    content_id => STRING
    data => ARRAY-OF-LINES | STRING
    description => STRING|FIELD
    disposition => STRING|FIELD
    eol => 'CR'|'LF'|'CRLF'|'NATIVE'
    file => FILENAME|FILEHANDLE|IOHANDLE
    filename => FILENAME
    language => STRING|ARRAY|LIST|FIELD
    log => LEVEL
    message => MESSAGE
    mime_type => STRING|FIELD|MIME
    modified => BOOLEAN
    nested => MESSAGE
        The message which is encapsulated within this body.

    trace => LEVEL
    transfer_encoding => STRING|FIELD

    example:

     my $msg   = $folder->message(3);
     my $encaps= Mail::Message::Body::Nested->new(nested => $msg);

     # The body will be coerced into a message, which lacks a few
     # lines but we do not bother.
     my $intro = Mail::Message::Body->new(data => ...);
     my $body  = Mail::Message::Body::Nested->new(nested  => $intro);

  Constructing a body
Extends "Constructing a body" in Mail::Message::Body.

$obj->attach($messages, %options)
    Inherited, see "Constructing a body" in Mail::Message::Body::Construct

$obj->charsetDetect(%options)
    Inherited, see "Constructing a body" in Mail::Message::Body::Encode

Mail::Message::Body::Nested->charsetDetectAlgorithm( [CODE|undef|METHOD] )
    Inherited, see "Constructing a body" in Mail::Message::Body::Encode

$obj->check()
    Inherited, see "Constructing a body" in Mail::Message::Body::Encode

$obj->concatenate($components)
    Inherited, see "Constructing a body" in Mail::Message::Body::Construct

$obj->decoded(%options)
    Inherited, see "Constructing a body" in Mail::Message::Body

$obj->encode(%options)
    Inherited, see "Constructing a body" in Mail::Message::Body::Encode

$obj->encoded(%options)
    Inherited, see "Constructing a body" in Mail::Message::Body::Encode

$obj->eol( ['CR'|'LF'|'CRLF'|'NATIVE'] )
    Inherited, see "Constructing a body" in Mail::Message::Body

$obj->foreachLine((CODE))
    It is NOT possible to call some code for each line of a nested because that would damage the header of the encapsulated message

$obj->stripSignature(%options)
    Inherited, see "Constructing a body" in Mail::Message::Body::Construct

$obj->unify($body)
    Inherited, see "Constructing a body" in Mail::Message::Body::Encode

  The body
Extends "The body" in Mail::Message::Body.

$obj->isDelayed()
    Inherited, see "The body" in Mail::Message::Body

$obj->isMultipart()
    Inherited, see "The body" in Mail::Message::Body

$obj->isNested()
    Inherited, see "The body" in Mail::Message::Body

$obj->message( [$message] )
    Inherited, see "The body" in Mail::Message::Body

$obj->partNumberOf($part)
    Inherited, see "The body" in Mail::Message::Body

  About the payload
Extends "About the payload" in Mail::Message::Body.

$obj->charset()
    Inherited, see "About the payload" in Mail::Message::Body

$obj->checked( [BOOLEAN] )
    Inherited, see "About the payload" in Mail::Message::Body

$obj->contentId( [STRING|$field] )
    Inherited, see "About the payload" in Mail::Message::Body

$obj->description( [STRING|$field] )
    Inherited, see "About the payload" in Mail::Message::Body

$obj->disposition( [STRING|$field] )
    Inherited, see "About the payload" in Mail::Message::Body

$obj->dispositionFilename( [$directory] )
    Inherited, see "About the payload" in Mail::Message::Body::Encode

$obj->isBinary()
    Inherited, see "About the payload" in Mail::Message::Body::Encode

$obj->isText()
    Inherited, see "About the payload" in Mail::Message::Body::Encode

$obj->language( [@langs|\@langs|$langs|$field] )
    Inherited, see "About the payload" in Mail::Message::Body

$obj->mimeType()
    Inherited, see "About the payload" in Mail::Message::Body

$obj->nrLines()
    Inherited, see "About the payload" in Mail::Message::Body

$obj->size()
    Inherited, see "About the payload" in Mail::Message::Body

$obj->transferEncoding( [STRING|$field] )
    Inherited, see "About the payload" in Mail::Message::Body

$obj->type( [STRING|$field] )
    Inherited, see "About the payload" in Mail::Message::Body

  Access to the payload
Extends "Access to the payload" in Mail::Message::Body.

$obj->endsOnNewline()
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->file()
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->forNested(CODE)
    Execute the CODE for the nested message. This returns a new nested body object. Returns "undef" when the CODE returns "undef".

$obj->lines()
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->nested()
    Returns the Mail::Message::Part message which is enclosed within this body.

$obj->print( [$fh] )
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->printEscapedFrom($fh)
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->string()
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->stripTrailingNewline()
    Inherited, see "Access to the payload" in Mail::Message::Body

$obj->write(%options)
    Inherited, see "Access to the payload" in Mail::Message::Body

  Internals
Extends "Internals" in Mail::Message::Body.

$obj->addTransferEncHandler( $name, <$class|$object> )
Mail::Message::Body::Nested->addTransferEncHandler( $name, <$class|$object> )
    Inherited, see "Internals" in Mail::Message::Body::Encode

$obj->contentInfoFrom($head)
    Inherited, see "Internals" in Mail::Message::Body

$obj->contentInfoTo($head)
    Inherited, see "Internals" in Mail::Message::Body

$obj->fileLocation( [$begin, $end] )
    Inherited, see "Internals" in Mail::Message::Body

$obj->getTransferEncHandler($type)
    Inherited, see "Internals" in Mail::Message::Body::Encode

$obj->isModified()
    Inherited, see "Internals" in Mail::Message::Body

$obj->load()
    Inherited, see "Internals" in Mail::Message::Body

$obj->modified( [BOOLEAN] )
    Inherited, see "Internals" in Mail::Message::Body

$obj->moveLocation( [$distance] )
    Inherited, see "Internals" in Mail::Message::Body

$obj->read( $parser, $head, $bodytype, [$chars, [$lines]] )
    Inherited, see "Internals" in Mail::Message::Body

  Error handling
Extends "Error handling" in Mail::Message::Body.

$obj->AUTOLOAD()
    Inherited, see "Error handling" in Mail::Message::Body

$obj->addReport($object)
    Inherited, see "Error handling" in Mail::Reporter

$obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
Mail::Message::Body::Nested->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
    Inherited, see "Error handling" in Mail::Reporter

$obj->errors()
    Inherited, see "Error handling" in Mail::Reporter

$obj->log( [$level, [$strings]] )
Mail::Message::Body::Nested->log( [$level, [$strings]] )
    Inherited, see "Error handling" in Mail::Reporter

$obj->logPriority($level)
Mail::Message::Body::Nested->logPriority($level)
    Inherited, see "Error handling" in Mail::Reporter

$obj->logSettings()
    Inherited, see "Error handling" in Mail::Reporter

$obj->notImplemented()
    Inherited, see "Error handling" in Mail::Reporter

$obj->report( [$level] )
    Inherited, see "Error handling" in Mail::Reporter

$obj->reportAll( [$level] )
    Inherited, see "Error handling" in Mail::Reporter

$obj->trace( [$level] )
    Inherited, see "Error handling" in Mail::Reporter

$obj->warnings()
    Inherited, see "Error handling" in Mail::Reporter

  Cleanup
Extends "Cleanup" in Mail::Message::Body.

$obj->DESTROY()
    Inherited, see "Cleanup" in Mail::Reporter

DETAILS
Extends "DETAILS" in Mail::Message::Body.

DIAGNOSTICS

Warning: Charset $name is not known
    The encoding or decoding of a message body encounters a character set which is not understood by Perl's Encode module.

Warning: No decoder defined for transfer encoding $name.
    The data (message body) is encoded in a way which is not currently understood, therefore no decoding (or recoding) can take place.

Warning: No encoder defined for transfer encoding $name.
    The data (message body) has been decoded, but the required encoding is unknown. The decoded data is returned.

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.

Warning: Unknown line terminator $eol ignored
Error: You cannot use foreachLine on a nested
    foreachLine() should be used on decoded message bodies only, because it would modify the header of the encapsulated message. which is clearly not acceptable.

SEE ALSO
This module is part of Mail-Message distribution version 3.017, built on April 18, 2025. Website: http://perl.overmeer.net/CPAN/

LICENSE
Copyrights 2001-2025 by [Mark Overmeer <markov@cpan.org>]. 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/