Comment 9 for bug 254130

ok, it was cron, i disabled the "useful" auto-sending mail feature (please inform the user of that behavior, i founded a lot of desperate clueless people on many forums)
now i just get some errors from apt, like:

/etc/cron.daily/apt: could not lock the APT cache while performing daily cron job.
Is another package manager working?

how can i configure nullmailer to not make grow /var/spool/nullmailer/queue ? i don't want to sand any mail to my isp, of course...