vb.net barcode library Basic E-Mail Tasks in Java

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Basic E-Mail Tasks
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Evolution s e-mail functionality is arguably the heart of the program. Although it offers a lot of features, it is quite simple to use. If you ve ever used any other mainstream e-mail client, such as Microsoft Outlook, you have a head start.
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This section describes how to accomplish several everyday tasks within the e-mail component of Evolution. When you start Evolution, the e-mail mode is selected automatically. However, if it isn t, or if you ve switched to a different mode within the program, simply click the Mail button at the bottom left of the program window.
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Sending and Receiving E-Mail
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Once Evolution has been set up correctly to work with your e-mail servers, as outlined in 8, you can simply click the Send/Receive button on the toolbar to connect to the server(s) and both send and receive e-mail. You may need to enter your password if you didn t enter it during setup. You can check the Remember Password box to avoid having to type it again, but this will mean the password is stored on your hard disk, posing a security risk if other people have access to your PC.
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Note Although e-mail is normally sent as soon as you click the Send button when composing it, if the sending has been delayed for any reason (such as being offline at the time), it will be sent as soon as you click the Send/Receive button. Until that point, it will be held in the Outbox folder on the left side of the program window.
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Any outstanding mail is sent first, and then the receiving procedure is started. As shown in Figure 27-2, a status dialog box will tell you how many messages there are and the progress of the download. Clicking the Cancel button will stop the procedure (although some messages may already have been downloaded). When you get a new e-mail, an envelope icon blinks in the notification area in the top right of the desktop, and a small window appears to tell you that you have mail.
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Figure 27-2. You ll see a progress display whenever you click the Send/Receive button.
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E-MAIL SIGNING AND ENCRYPTION
In 9, you learned how to use the Seahorse application to set up a public key pair. This allows you to encrypt e-mail messages destined for other people, so that only they can read the messages (provided you have their public key), and digitally sign your own e-mail, so recipients can be sure messages came from you (provided they have your public key). If you ve followed the instructions to set up the key pair, you now need to configure Evolution to use it. After doing this, and when you send a new e-mail message, you can select whether you wish to encrypt the e-mail and/or digitally sign it. Remember that setting up encryption is not obligatory, and relatively few people in the wider world use e-mail encryption or signing. Assuming you ve already set up an account within Evolution, here s the procedure for configuring Evolution for encryption and digital signing:
1. Click Edit Preferences, ensure the Mail Accounts icon is selected on the left side of the window,
and select your mail account in the list on the right side of the window. Then click the Edit button. In the dialog box that appears, click the Security tab.
2. You now need to find your PGP key ID using Seahorse. Click Applications Accessories Passwords
and Encryption Keys. Locate your key in the list under the My Personal Keys tab, and look under the Key ID heading. You should see an eight-character hexadecimal number, like F0C1B52A. Write this down, remembering that any 0 you see is a zero, and not the letter O.
3. Switch back to the Evolution dialog box and type the PGP key ID you found into the PGP/GPG Key
ID box. If you wish every e-mail message you send to be digitally signed automatically, which is a good idea (the message itself won t be encrypted, so even if the recipients are not using encryption, they will still be able to read it), put a check in the Always Sign Messages When Using This Account box. Then click OK. Encrypting outgoing messages, or signing them if you haven t selected to automatically do so, is easy. When composing a new message, click the Security menu entry and select either or both PGP Sign and PGP Encrypt. Remember that you ll need to have imported the recipient s public key via Seahorse if you want to encrypt a message addressed to that person, or you ll see an error. If you sign a message, upon sending it, you ll be prompted to enter the PGP passphrase you entered when you created the key pair back in 9. If upon sending an e-mail message, you see the error message Failed to execute GPG: Broken pipe, it s likely you mistyped your key ID when you configured Evolution. Try again. If you receive a message that has been encrypted using your public key, Evolution will automatically prompt you to enter your PGP passphrase to decrypt it. This is the passphrase you entered when creating your key pair back in 9. When you receive a message from someone who uses digital signing, and you have that person s public key, the message should contain a green bar along the bottom containing the words Valid signature. If you see words to the effect that the signature is invalid, or if the signature is missing, then you should be suspicious and independently verify the authenticity of the e-mail message.
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