Gmail with Imap on Kmail 1.10.0

Receiving:

"General" tab

Account name: "'Gmail', for example"
Host: imap.gmail.com
Port: 993
Login: "put your complete email address here"
Password: "your email's password"

"Security" tab:

Choose:

Encryption:

Use SSL for secure mail download

Authentication Method:

Clear text

Sending:

"General" tab:

Name: "'Gmail', for example"
Host: smtp.gmail.com
Port: 587

Encryption:

TLS

"Advanced" tab:

choose "server requires authentication"

login: "put here your email name, without @gmail.com"
password: "your email's password"

Authentication method:

plain

On both sending and receiving you can choose to store your email's password.