checked that tutorial. the only difference ot what I was doing is this step:
Now go to the PHP open_basedir field on the Options tab of your web site in ISPConfig and add the directories /usr/share/squirrelmail and /etc/squirrelmail (that's the directory where SquirrelMail's configuration is stored) to the line,
I think its quite bothersome to add those lines to every vhost.
where would I add those fi I want them enabled globally to ANY vhost? (existing and future)
never mind I found the option inside the ispcfg3 setup.