I have tested KMail with gmail and you can recive your messages via POP3

to enable POP in gmail do the following:

 







 

and enale POP once you have done this open KMail and goto configure

KMail select the network icon and then click the reciving tab click add and select POP3

gmails details is:

 







 

Click the extra tab and tick the use SSL button. once this is done goto file and click check mail or

Ctrl + L

 

Any you are now able to get gmail emails