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courrier électronique, messageries communaute de noctambules
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Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 27

Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 28

Strict Standards: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 14

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Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 28

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LE COURRIER ÉLECTRONIQUE

Définition :

E-MAIL : Electronic Mail. Désigne les messages échangés entre des utilisateurs par le moyen d’Internet, les messages sont stockés sur des serveurs avant d’être lus par les destinataires. Le Courrier électronique (Mél ou Courriel - Québec- ou e-mail) est l’un des outils Internet les plus utilisés.
De la même manière que dans le courrier postal, il permet à deux ou plusieurs personnes de s’envoyer des messages, la différence étant que les messages sont sous forme numérique et qu’on utilise son ordinateur comme boîte postale.
C’est un moyen de communication rapide, peu coûteux (prix de la connexion Internet), qui pemet de plus d’envoyer des documents, des sons et des images en format numérique.

Fonctionnement du courrier électronique :

Le courrier électronique fonctionne selon le mode client/serveur.
Le logiciel de courrier électronique client est utilisé par l’usager pour

-rédiger un message électronique
-envoyer et recevoir du courrier électronique
-lire les messages reçus

Le logiciel serveur est utilisé par le serveur pour :

-entreposer les messages reçus. Ainsi, lorsqu’un usager va chercher ses messages, il se connecte à son serveur de courrier électronique pour les télécharger;
-acheminer les messages envoyés par l’usager sur Internet jusqu’à leur destination finale, c’est-à-dire jusqu’au serveur de courrier électronique du destinataire.

Le fonctionnement du courrier électronique est basé sur l’utilisation d’une boîte à lettres électronique. Lors de l’envoi d’un email, le message est acheminé de serveur en serveur jusqu’au serveur de messagerie du destinataire. Plus exactement, le message est envoyé au serveur de courrier électronique chargé du transport (nommé MTA pour Mail Transport Agent), jusqu’au MTA du destinataire. Sur internet, les MTA communiquent entre-eux grâce au protocole SMTP et sont logiquement appelés serveurs SMTP (parfois serveur de courrier sortant).

Le serveur MTA du destinataire délivre alors le courrier au serveur de courrier électronique entrant (nommé MDA pour Mail Delivery Agent), qui stocke alors le courrier en attendant que l’utilisateur vienne le relever. Il existe deux principaux protocoles permettant de relever le courrier sur un MDA :

* le protocole POP3 (Post Office Protocol), le plus ancien, permettant de relever son courrier et éventuellement d’en laisser une copie sur le serveur.
* le protocole IMAP (Internet Message Access Protocol), permettant une synchronisation de l’état des courriers (lu, supprimé, déplacé) entre plusieurs clients de messagerie. Avec le protocole IMAP une copie de tous les messages est conservée sur le serveur afin de pouvoir assurer la synchronisation.

Ainsi, les serveur de courrier entrant sont appelés serveurs POP ou serveurs IMAP, selon le protocole utilisé.

Quel est le parcours d’un courrier électronique ? :

C’est presque une lapalissade, mais le rappel est important : un courrier électronique circule par définition sur Internet. En clair, il passe d’ordinateur en ordinateur (ou de serveur en serveur), de l’ordinateur de l’expéditeur à celui du destinataire. Pour ce, il emprunte différentes voies et utilise plusieurs protocoles.

Voici, en gros, le cheminement d’un courrier électronique :

Lorsque l’expéditeur envoie un courrier électronique, il met en oeuvre le protocole SMTP. Il utilise à cet effet le serveur SMTP de son fournisseur d’adresses.
L’e-mail entre alors dans la nébuleuse Internet. D’ordinateur en ordinateur, celui-ci est acheminé selon un parcours qui peut varier vers le serveur du destinataire. Les différents serveurs de courrier électronique s’échangent les e-mails de nouveau selon le protocole SMTP.
Pour consulter ses messages, le destinataire doit les relever en utilisant le protocole POP. Il utilise ainsi le serveur POP (ou POP3) de son fournisseur d’adresses. Il peut également, si son fournisseur d’adresses le lui permet, utiliser le protocole IMAP, plus puissant.

STOCKAGE DES COURRIERS
LES PROTOCOLES
ACCENTS DANS LES MAILS
STANDARD MIME
WEBMAILS GRATUITS

Comment surfer sur Internet ?
Ce dossier va vous permettre de parfaitement connaitre les bonnes références pour surfer vite et bien. Vous étudierez les moteurs de recherche, les annuaires, ainsi que les bases de données !
Vive le web rapide et efficace !

Sécuriser son pc
Ici, vous trouverez toutes les solutions contre les agressions exterieures, pour maintenir son pc en bon état de fonctionnement. Vous protègez de toutes les agressions du web: vers, virus, chevaux de troie et autres spywares. Pour combattre au quotidien ces attaques sur Internet et les moyens de s’en protéger…

Hardware, le matériel informatique
Retrouvez tous les éléments physiques informatiques, pouvant appartenir à un ordinateur, du moniteur…à la mémoire vive. Pour connaitre en profondeur le matériel de son ordinateur avec la rubrique hardware sur caensortir.com.

Lexique-glossaire informatique
Voici un petit lexique destiné à mieux connaître la signification des principaux termes employés dans le jargon informatique…Vous pouvez rechercher une définition particulière en utilisant l’index thématique. Tous les termes de A à Z.

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Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-content/plugins/math-comment-spam-protection/math-comment-spam-protection.classes.php on line 77

Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-content/plugins/math-comment-spam-protection/math-comment-spam-protection.classes.php on line 163