Mail client

Mail client . It is responsible for communicating with the mail server , collecting the messages that have reached the electronic mailbox and displaying them in an orderly manner so that they can be read in comfort. Likewise, it allows you to write new messages and is also responsible for delivering them to the mail server so that it can channel them to their destination.


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  • 1 Types of clients and protocols
    • 1 protocols
  • 2 Configuration
  • 3 Some email clients
    • 1 For Windows
    • 2 For Linux
  • 4 Sources

Client types and protocols

Three types of mail clients can be distinguished according to the way of accessing them:

  • Installed on a PC. They run directly from a personal computer. On personal computers with Windows / xx as the operating system , mail clients will be versions for Windows such as: Eudora , Pegasus , Messenger (Mozilla), Messenger (Netscape), Outlook (Microsoft), Outlook Express (Microsoft), Exchange ( Microsoft), etc.
  • Residents on the server. It requires connecting to the server via remote terminal using encrypted connection (ssh, which is the preferred option), or simple connection (telnet, anzio, netterm, qvtnet, …). Once the remote terminal of the server is opened, one of the mail clients installed on it is executed.
  • Through the Web. From a web browser it is possible to access, through a web-secure (encrypted) connection, the received messages, as well as send new messages.


  • SMTP (Simple Mail Transfer Protocol)

It is the basic protocol for transferring mail from the client to the server and was designed to transport simple text notes. It transmits the data in ASCII (American Standard Code for Information Interchange) using 7 bit, which means that for example the texts in Spanish are transmitted without an accent, since only the 127 characters of the ASCII code are used.

The extensions to the ESMTP protocol allow to transport any type of information. The Multipurpose Internet Mail Extensions (MIME) standard allows many types of information to be delivered by sending it as an attachment to a message. Using MIME you can send documents created by word processors, images, videos, encoded sound, spreadsheets, executable code and other things. Through these extensions it is possible to send texts with punctuation, accents and symbols, since it encodes 8 bits into 7 bits.

  • IMAP (Internet Message Access Protocol)

In IMAP, messages and auxiliary folders with messages always remain on the server. Therefore when deleting a message it is deleted there and when a new message folder is created it is created on the server. If a user connects to the server from another computer or with another client (which should also be IMAP to not change anything) he will be able to see all his messages, as they are on the server, he can access old messages regardless of the PC from which connect.

  • POP (Post Office Protocol) -3

In POP -3, the default behavior, unless certain configuration options are activated, is to always download the messages to a directory on the PC and automatically delete them from the server. When a message is deleted it is being deleted on the user’s PC (it has already been deleted on the server by the mail client) and when a new folder is created it is created on the user’s PC. Nothing is saved on the server after download. When mail is accessed from another PC or from another client, you will not be able to see any of the old messages, since they are recorded on the user’s PC.

When a person always checks their mail from the same personal computer and never from another site, POP-3 can help. In any other circumstance, especially very traveling people, the appropriate option is always IMAP.

In practically all mail clients, you can choose between the two modes, except in two cases that always work as IMAP: pine (there is no case for POP-3) and in the Web client (there are technical considerations that rule out POP-3). as an option).


Once the protocol has been chosen, the client must be configured to use it. In order to do this, the mail provider needs the username, password and the names of the servers that will be used to connect and send or receive messages. Mail clients usually have setup wizards, which makes this easy.

  • Name: the name that will appear as the sender name in all emails sent from a specific account.
  • Email address: the complete email address
  • Password: the password that will be used to connect and send and receive messages.

After entering all these data, a second screen will appear to configure the email servers, where the names assigned by the provider are written.


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