I got around 7500+ deferred mails in my server last day. The mails were sent by cron to root after executing each scripts (there are scripts which run in every second). But here, when I scanned /var/spool/mail/root, the size was 2.1 GB. I moved that file to a different location and then created a file root with the same permissions and owner as before. Then the problem was fixed!!! Why did this happen? Is it because of any settings problem in the sendmail or is tat a quota issue. But I haven't set any quota for root. Please advice.