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MIME and IMAP protocols

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MIME (Multipurpose Internet Mail Extension)

  • Für das Kennzeichnen der Art der Daten, die in einer Akte basiert auf seiner Verlängerung enthalten werden, wird Multipurpose Internet Mail Extension, ein Standardsystem verwendet.



  • Um Binärdateien über dem Internet als Zubehöre zu den E-mail Anzeigen zu schicken, wird MIME Protokoll verwendet und es ist ein Internet Protocol.



  • Dieses schließt Graphiken, Bildschirm-, Ton- und Fotoakten und formatierte Textdokumente mit ein.




Allgemeine MIME Daten-Arten

Obgleich die ersten MIME Mittelarten Grundmodellen entsprechen, die alle Benutzer verstehen würden, fallen nicht alle Formationsglieder unter die offensichtliche Mittelkategorie und die, die mit spezifischer Anwendersoftware zum Beispiel sind können eingestuft werden, während Anwendung anstatt Text, Bild oder Audio schreibt, trotz über dem Internet vorhanden weit sein. Häufig erfordern diese Datenarten eine Datenbanksuchroutinesteckverbindung, bevor ihr Inhalt richtig verarbeitet wird, als das Besuchen einer Web site oder der Klient Datenbanksuchroutine dich bitten konnte, zu spezifizieren, welche Anwendung mit Dateiextension oder diesem Formationsglied verbunden ist.

Die folgende Tabelle beschreiben die meisten allgemeinen MIME Textarten:

MIME Type File Extensions Common Format Name Description
text/plain txt Text US ASCII text with no format tags
text/html .html, .htm HyperText Markup Language Defines World Wide Web pages
application/rtf .rtf Rich Text Format Vendor-independent word processing file type with some formatting capabilities
application/      
postscript ps, .ai, .eps PostScript Print and display format
application/pdf pdf Portable Document Adobe's PDF Format used by Acrobat for platform-independent display and printing



New Header Fields in MIME

    MIME defines the following new header fields:

    1. MIME-Version, which uses a version number to declare that a message conforms to MIME standard.

    2. Content-Type, which can be used to specify the subtype and type of data in the body of a message and to fully specify the encoding of such data. It includes also a subtype option. The seven Content-types specified are:

      1. Text - to represent textual information in a number of character sets.
      2. Image - for transmitting still image (picture) data.
      3. Audio - for transmitting audio or voice data.
      4. Video - for transmitting video or moving image data.
      5. Message - for encapsulating a mail message.
      6. Multipart - to combine several body parts, possibly of different types of data, into a single message.
      7. Application - to transmit application data or binary data.
    3. Content-Transfer-Encoding, which specifies how the data is encoded to allow it to pass through mail transports having data or character set limitations.

    4. Content-ID (optional), which enables labeling bodies, thus allowing one body to reference another.

    5. Content-Description (optional), which enables associating descriptive information with a body.




IMAP(Internet Message Access Protocol)

  • Ein Protokoll, einem Klienten erlaubend, Anzeigen der elektronischen Post auf einem Bediener und ihm zu manipulieren und zugänglich zu machen, ermöglicht Handhabung der Remoteanzeige Hefte (Briefkästen), in einer Weise, die mit lokalen Briefkästen funktionell gleichwertig ist.



  • IMAP schließt Betriebe für das Herstellen, das Löschen und die Umbennenung der Briefkästen ein; überprüfung auf neue Anzeigen; Anzeigen dauerhaft entfernen; Suchen; und vorgewähltes Holen der Anzeige Attribute, der Texte und der Teile davon. Sie spezifiziert nicht Mittel der Eintragung von Post; diese Funktion wird durch ein Postübergangsprotokoll wie smtp angefaßt.






  • IMAP Grundlagen - was sie ist und was sie tun kann.

    Für jedermann, das eine Anforderung hat, Mehrfachverbindungsstelle unterschiedliche Postkonten zugänglich zu machen, die auf unterschiedlichen Maschinen liegen, wird Zugang zu email problematisch und viele Postsysteme verwenden das tried und geprüfte Protokoll POP3. Klient POP3 Anwendungen downloaden die Post vom Bediener und speichern sie auf dem Klient Computer. Die meisten Klienten speichern Post in ihrem eigenen Format und bilden sie unzugänglich durch andere Postprogramme, und die meisten Maschinen, die Klienten POP3 laufen lassen, sind Schreibtische, die selten auf 24/7 sind, weiterer reduzierender Zugang zur Post, sobald sie downloadet worden ist.

    Das IMAP Protokoll versucht, einige dieser Probleme zu beheben und die Stärke von IMAP liegt innen online und getrennter Betrieb. Anders als POP3 wird Post nicht vom Bediener kopiert und gelöscht dann - stattdessen, manipulieren IMAP Klienten die Post auf dem Bediener und ermöglichen Zugang zur Direktübertragung, Bediener bewirtete Briefkästen, als wenn sie lokale Betriebsmittel waren.

     

    • An IMAP mail system has a number of immediate advantages for users which are given below:-

    • As all mail is stored on the server and changing mail client becomes the work of seconds - all that is required is to configure a new IMAP client with the IMAP account details.

    • An IMAP client can easily be configured to view the multiple mailboxes in physically separate servers.

    • Multiple IMAP clients can be used by each user and this makes implementing a webmail solution for roaming users a simple task.

    • IMAP maintains the message status flags on the server for read, answered, etc.

    • IMAP allows the idea of shared folders and this makes it easier to implement generic email accounts for an organisation, and then allow multiple users to access those accounts.

    • Many implementations also allow server side filtering of mail and this can be an extremely useful feature when users are accessing their mailboxes through different email clients.




    Comparing IMAP and POP
     
    Points POP IMAP
    What does it stand for? Post Office Protocol Internet Message Access Protocol
    Which protocol would suit me best?

    If you access mail using only one computer e.g. your office PC or a laptop.

    If you want to access your mail from multiple computers or locations.

    Which mail programs can I use?

    All mail programs or clients have POP capability

    Many mail programs now have some IMAP capability but you will generally need to use the latest version of one of the more popular programs such as Netscape Messenger, Eudora or Outlook Express to ensure that you can use full IMAP features. You will also be able to access your mail via a web page using any web browser.

    Some Common Tasks:    
    Check for incoming mail

    By default, incoming messages are transferred to your local machine when you check your incoming mail. Only new messages are available if you connect to the server using a PC other than your normal one. You are connected to the server only for the transfer of messages.

    By default, incoming messages stay on the server when you check your mail - only headers are transferred with full messages only downloaded when selected for reading. All your messages are always available no matter where or how you connect to the server. You remain connected to the server whilst you deal with mail but some clients allow for off-line working.

    Read and respond to mail

    Reading and responding to messages is done on your local machine.

    You can read and respond to messages directly on the server but you can also read and respond to messages on your local machine, after downloading for offline working (depending on client). When you reconnect, your mailboxes are resynchronised to reflect the changes you have made.

    Create mailboxes for storing messages

    Creating mailboxes can be done only on your local machine.

    You can create mailboxes directly on the server. By default, an Inbox is automatically created on the server when you begin using IMAP. The Inbox functions as the master mailbox (or folder) as well as the mailbox for incoming messages. All other mailboxes, including a trash box, need to be created within the Inbox.

    Move messages in and out of mailboxes

    You can move messages in and out of mailboxes only on your local machine.

    You can move messages in and out of mailboxes on the server and on your local machine.

    Transfer messages from local machine to server and vice versa

    You cannot transfer any messages from your local machine to the server. Messages are automatically transferred from the server to your local machine when you check your incoming mail.

    You can transfer individual messages from mailboxes on your local machine into mailboxes on the server and vice versa.

    Delete selected messages on the server

    When using some clients (e.g. Eudora), if you specified to leave messages on the server, you can delete individual messages left there.

    You can delete individual messages and groups of messages directly on the server as well as on your local machine.




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    Keywords: MIME and IMAP protocols, yahoo mail imap, imap mail server, outlook express imap, imap mail servers, imap email account, imap e mail, setting up imap, mime e mail, set up imap, mime rfc


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