Version: 1.6.2 (using KDE KDE 3.2.2)
Installed from: Slackware Packages
I'm a developer of a project called pop3share ( http://pop3share.sf.net )
which is a file server acting as a pop3 server. When using KMail to download large files (>150 Mb) of this sort of server KMail stars to lag really badly and use loads of memory and CPU. After a while it crashes (i assume it runs out of memory).
*** This bug has been marked as a duplicate of 59069 ***