Sorry for my ignorance, but sessions files are listed as what?
I'm in home/admispconfig/ispconfig/temp/
And then open the 'webmail' directory. There I find a list of all (or most) of the email users. (ie emailaddress_localhost) Are those what I should delete?
ps there is a lot of ispconfig.log.*.tar.gz files in the ispconfig directory. Are they fine?