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of the port. The port is almost always 25; the hostname should be given to you by your provider. If you have a local MTA installed and want to use it, simply enter localhost. If your mail server requires authentication (check with your provider if you are unsure), check the appropriate checkbox and fill in the login name and password. This is less common than you would think, however; most ISPs protect themselves against being used as spam relays either by only accepting outgoing mail from IP addresses that they have provided themselves, or by asking you to fetch your email (which always requires a login) first, and then sending outgoing email within a certain amount of time.

This should be enough to let you send outgoing email, but we recommend that you take a few additional steps to make this as secure as possible. KMail makes this easy for you by autodetecting the security settings of the SMTP server you are using. Go to the Security tab and click the button labeled "Check what the server supports." KMail will check the connection to the server and use the settings with the highest supported security and encryption. Alas, many providers run their mail servers without any encryption at all.

Figure 6-2. KMail identity configuration

Now let's continue by configuring the receiving end. Close all subdialogs until you are back at the Network configuration group, and select the Receiving tab. Here you can set up a number of accounts to be queried. This can be useful if you have more than one provider that stores email for you. Click the Add button and select the type of mail server. If you run your own MTA locally, you need to select Local Mailbox. Usually, you can then accept the defaults on the next page (but change the name to something more appropriate than "Default").

If you retrieve your messages directly from your provider's server, you need to select either POP3 or IMAP, depending on what your provider supports. In the dialog that appears again enter a name of your own choice, then specify your login name, your password, the name of the host that stores your email, and the port (usually 110 for POP3 and 143 for IMAP). All this information should be given to you by your provider or system administrator. You can leave all other options as they are for now, and experiment later with them.

Figure 6-3. KMail identity for outgoing mail

As an aside, recent KMail versions have a feature for retrieving your messages that make it stand apart from many other email clients. Traditionally, the IMAP protocol required an online connection to the IMAP server that is storing your messages because no messages are stored locally. KMail, however, also sports a mode called disconnected IMAP that caches your messages locally so that you can both use the benefits of IMAP, such as having the same view on your mailbox from different computers (e.g., your workstation and your laptop), and still work offline when the need arises. Intelligent synchronization mechanisms make sure that all computers always have the same view of your mailbox (of course, only after you have performed synchronizations).

Close all dialogs with the OK button. You should now be ready to retrieve your email. To do so, select File → Check Mail from the menu. This will retrieve all messages from all incoming mailboxes that you have specified. If it does not work or you get any error messages, check all the values you entered on the various configuration pages again and compare them to the information given to you by your provider or system administrator. The most typical error is a typo in the hostname, username, or password.

If you are using disconnected IMAP, the Check Mail menu item does a lot more than checking the server mailbox for new messages: it ensures that the server and your local mailbox are in the same state, which may include deleting messages from the server, changing flags, and so forth.

To send a message, press Ctrl-N or select Message → New Message. A composer window opens where you can type in the recipient's address, the subject,