Hi guys, My linux CentOS 4.5 postfix is misbehaving, from time to time I keep on getting the below error and during that time any account copied in the mail or is forwarded mail by that account gets multiple repetition of the same mail until delivery is made to the mailbox having a problem. Error: (cannot update mailbox /var/mail/foo. for user foo. unable to lock for exclusive access: Resource temporarily unavailable) Help!!!