I'm a Mandriva user for years. ISPConfig didn't work well with Mandriva so I tried other distro's. So far Debian seemed to be the best choice but now I ran into a new issue. I transfered a mailserver. One user needed 128MB storage space on the Mandriva server which uses the mbox format. That same user needs 535MB disk space on the Debian system with Mairdir. What a difference.
Sorry for this post. I made this mistake before. These are the real numbers: Mandriva: # du -sh /var/spool/mail/user /home/user/Mail/ 128M /var/spool/mail/user 316M /home/user/Mail/ 444 MB Debian: # du -sh /var/spool/mail/vs11_user /var/www/web1/user/vs11_user/Maildir/ 0 /var/spool/mail/vs11_user 535M /var/www/web1/user/vs11_user/Maildir/ 535 MB
Diference is simple becasuse mailboxes use diferent format...maildir and mailbox isnt same have own hierarchy and diferent storage demands....im using mandriva and maildir type and no problem.