[arch-dev-public] "No mail" popup since last kdebase-workspace

I have a "No mail" popup box each time I log into kde since the last kdebase-workspace update. This is not a big problem as kde load correctly after hitting the "Ok" button. It looks like this is related to the line session optional pam_mail.so dir=/var/spool/mail standard in /etc/pam.d/system-login. Any solution ? Stéphane