Postfix alias multiple mail delivery

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http://serverfault.com – We have a Postfix server here that is servicing about 70-80 active users. We have a single alias for all users in the system that we manage manually in /etc/aliases. Occasionally, email sent to this all users alias is deferred due to a number of reasons, some examples are given below: Jan 25 12:02:15 mailserver postfix/local[6733]: 78D4619014D: to=<user1@domain>, relay=local, delay=1956, delays=1936/0.01/0/20, dsn=4.2.0, status=deferred (cannot update mailbox /var/spool/mail/user1 for user user1. unable to create lock file /var/spool/mail/user1.lock: File exists) Jan 25 13:42:14 mail (HowTos)