Hi, I have (Debian Wheezy/Sid) ISPConfig 126.96.36.199p8. I've noticed in mail queque such messages: (temporary failure. Command output: /usr/bin/maildrop: Unable to create a dot-lock at /var/vmail/[subdomain]/[user]/1847.0.[hostname].) But this user is deleted. There are few more such messages regarding deleted accounts. I think this started when I upgraded Debian from 6 to 7.