This is a short introduction to Kmail and its usage so you can start working with it right away. For more in-depth information see the Using Kmail section.
Invoking Kmail for the first time creates a Mail directory containing the initial files (inbox, outbox, sent-mail, and trash) in your home directory. Kmail then pops up the Settings window where you must enter some initial information so Kmail will be able to properly retrieve and send your messages.
The Settings window consists of six tabs: Identity, Network, Appearance, Composer, Misc, and PGP. To begin sending and receiving email you will only have to change the settings in the Identity and Network tabs.
The settings in the Identity tab are fairly straightforward. Fill in the Name and Organization fields with the appropriate information if you want this information to be automatically included in the headers of any message that you send. Next, fill in the Email Address and the Reply-to Address field with your email address. Finally, set the location of your signature file in the Signature File field. You can skip setting the signature file if you do not have one, but every time you compose a new message, Kmail will ask you for your signature file.