Tnef

topic - Kurzbeschreibung

Installation

# apt install tnef

Siehe auch

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• Tnef

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TNEF

TNEF ist ein Programm zur Dekomprimierung von MIME-Anhängen des Typs

»application/ms-tnef«. Dies ist ein typischer Microsoft-Anhang.

Das Programm ermöglicht das Auspacken von in TNEF eingekapselten Anhängen. Dies mildert die Notwendigkeit des Gebrauches von Microsoft Outlook, um diese Anhänge zu betrachten.

libkf5tnef5

Bibliothek zur Handhabung von TNEF-Daten

Die Bibliothek Ktnef kann Daten im TNEF-Format handhaben. (Transport Neutral Encapsulation Format ist ein proprietäres Format von E-Mail-Anhängen, das von Microsoft Outlook und Microsoft Exchange Server verwendet wird.) Die API ermöglicht einen Zugriff auf die Anhänge und die Nachrichteneigenschaften (TNEF/MAPI). Außerdem kann man mit Ktnef im Rich Text Format verfasste Nachrichten ansehen/extrahieren.

Manpage

NAME

tnef - decode Microsoft's Transport Neutral Encapsulation Format

SYNOPSIS

tnef [options] [FILE]

tnef {--help | --version}

DESCRIPTION

This manual page documents the tnef filter. tnef decodes e-mail attachments encoded in Microsoft's Transport Neutral Encapsulation Format (hereafter, TNEF), which "wraps" Microsoft e-mail attachments.

Unfortunately, these "wrapped" attachments are inaccessible to any e-mail client that does not understand TNEF. Fortunately, the tnef filter can be used by any MIME-aware client to unpack these attachments.

OPTIONS

-f FILE, --file=FILE use FILE as input ('-' denotes stdin). When this option is omitted, tnef reads data from stdin.

-C DIR, --directory=DIR unpack file attachments into DIR.

-x SIZE, --maxsize=SIZE limit maximum size of extracted archive (bytes)

-t, --list list attached files, do not extract. For each file in the datafile the file name and full path will be printed.

If the verbose option is also provided then this option acts as the --list-with-mime-types option and also prints the file length (in bytes) and the date of the file before the other data.

--list-with-mime-types same as list option but also prints MIME type and content ID of each file after filename and file path.

-w, --interactive, --confirmation ask for confirmation for every action.

--overwrite when extracting attachments, overwrite existing files.

--number-backups when extracting attachments, if file FOO will be overwritten, create FOO.n instead.

--use-paths honor file pathnames specified in the TNEF attachment. For security reasons, paths to attached files are ignored by default.

--save-body FILE Save message body data found in the TNEF data. By default tnef only extracts the attached files and not the message body.

There can be up to three message bodies in the file, plain text, HTML encoded, and RTF encoded. Which are saved is specified by the --body- pref option. By default the message bodies are written to a file named message with an extension based upon the type (txt, html, rtf).

--body-pref PREF Specifies which of the possibly three message body formats will be saved. PREF can be up to three characters long and each character must be one of 'r', 'h', or 't' specifying RTF, HTML or text. The order is the order that the data will be checked, the first type found will be saved. If PREF is the special value of 'all' then any and all message body data found will be saved. The default is 'rht'.

--save-rtf FILE DEPRECATED. Equivalent to --save-body=FILE --body-pref=r

-h, --help show usage message.

-V, --version display version and copyright.

-v, --verbose produce verbose output.

--debug enable debug output. (This will produce a very large amount of output.)

KNOWN LIMITATIONS

tnef ignores the OEMCodePage data in the data file. It assumes Unicode data.

EXAMPLE

The following example demonstrates typical tnef usage with a popular Unix mail client called "mutt".

Step 1 — Configure ~/.mailcap Mutt can't use tnef for its intended purpose until an appropriate content type definition exists in ~/.mailcap. Here's a sample definition:

application/ms-tnef; tnef -w %s

This mailcap entry says that whenever the MIME content type:

application/ms-tnef

is encountered, use this command to decode it:

tnef -w %s

The latter command string invokes tnef, specifying both the -w option and the attachment (created as a temporary file) as command line arguments.

Step 2 — Add The Filter To $PATH Mutt can't invoke tnef if the filter isn't accessible via $PATH.

Step 3 — Test Mutt Use mutt to read a message that includes a TNEF attachment. Mutt will note that an attachment of type "application/ms-tnef is unsupported".

Press the "v" key to open mutt's "view attachment" menu.

Move the cursor over the TNEF attachment and press the enter key to "view" the attachment. Mutt will launch tnef and invoke it using the command line syntax specified in ~/.mailcap (step 1). tnef then decodes all file(s) included in the TNEF attachment, prompting for confirmation prior to creating an individual file (refer to -w option above). -w is useful here because it gives the end user a chance to view the filename(s) included in the mail message.

Note that Mutt's attachment menu also supports a pipe option, which permits the user to pipe attachments to an external filter (how convenient). So, to list the contents of a TNEF attachment prior to decoding it, press the "|" key and enter this command:

tnef -t

SEE ALSO

metamail(1), mailcap(4), mutt(1), other email clients.

AUTHOR

Mark Simpson <verdammelt@gmail.com>

REPORTING BUGS

Please report issues via this project's issue tracker on GitHub: https://github.com/verdammelt/tnef/issues

OTHER REFERENCES

This web page:

https://www.dwheeler.com/essays/microsoft-outlook-tnef.html

describes how to configure Microsoft email clients so that the TNEF format is disabled when sending messages to non-TNEF-compatible clients.

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