I set up a Kmail account and there was no way to decide where to put the data on the disk, so I thought I'll just use it online only, I did not check "Enable disconnected mode". However soon after I noticed there is 2 GB of free space on my disk less. I though I got something wrong, I removed all accounts and set it up all again. I lost another 2 GB of my disk space. I cannot find out where does Kmail save this data to nor how to disable downloading it on the disk or even how to delete those mails from the disk (and not from the server). Could somebody help me please? My OS is set up on a small SSD partition, I can't waste so much space of it. I use Linux Mint 17 KDE.

check these
~/.kde4/share/apps/kmail
~/.local/share/local-mail

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Are those all possible places the data could be stored by default? If so, I guess something else took the space. Thanks for the help.