getting root trying to send itself messages in postfix

Hi, I am getting the following warning message from mail.log on ubuntu server 10.04. testserver1 postfix/pickup[26644]: AA27A2BE0055: uid=0 from=<root> testserver1 postfix/cleanup[26742]: AA27A2BE0055: message-id=<20111120230022.AA27A2BE0055(at)testserver1> testserver1 postfix/qmgr[1422]: AA27A2BE0055: from=<root(at)testserver1>, size=1588784, nrcpt=1 (queue active) testserver1 postfix/local[26744]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled testserver1 postfix/local[26744]: AA27A2BE0055: to=<root(at)testserver1>, orig_to=<root>, relay=local, delay=21, delays=21/0.02/0/0.16, dsn=2.0.0, status=sent (delivered to mailbox) testserver1 postfix/qmgr[1422]: AA27A2BE0055: removed I wonder if anyone might be able to explain why the root is trying to send to itself. The other thing is I realized that I use alias in main.cf as follows append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix inet_interfaces = all inet_protocols = ipv4 local_recipient_maps = ldap:/etc/postfix/ldap-users-auth.cf mail_spool_directory = /var/spool/mail mailbox_size_limit = 0 mydestination = localhost.$mydomain,localhost,$mydomain,$myhostnam e mydomain = example-com myhostname = testserver1 mynetworks = 127.0.0.0/8 mynetworks_style = subnet readme_directory = no recipient_delimiter = + relayhost = smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject _unauth_destination,reject_sender_login_mismatch smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = mycompany-com smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot virtual_alias_maps = hash:/etc/postfix/valias virtual_gid_maps = static:106 virtual_mailbox_base = /home/vmail virtual_mailbox_domains = mycompany-com virtual_mailbox_maps = hash:/etc/postfix/virtual_mailboxes virtual_minimum_uid = 100 virtual_transport = dovecot virtual_uid_maps = static:106 My question is whether or not I need to define NIS or perhaps disable it. Any help would be greatly appreciated. Thank you in advance

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