An SMTP server just collects all mail for the domain it is set up for. IMAP and POP3 are 2 different ways to get mail from the SMTP server to your local client (ie: kmail)
Quote:
I have yahoo and gmail account
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These are webmail. That is, they are interfaces for sending/reading mail using a browser over the internet. Kmail is a local client that runs on your computer.
I don't know about yahoo, but you can use pop3 to access your gmail. Look in the settings, then configure kmail to login to gmail using pop3...