[root@mail4 postfix]# telnet localhost 25 Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape character is '^]'. 220 mail4.domain.com ESMTP Postfix ehlo domain.com 250-mail4.domain.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-XVERP 250 8BITMIME mail from:root@domain.com 250 Ok rcpt to:fmaster@domain.com ( local unix user) 250 Ok data 354 End data with . testing . 250 Ok: queued as 26C1D680067 quit 221 Bye Connection closed by foreign host. postconf -n alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 mail_owner = postfix mailbox_command = '' mailq_path = /usr/bin/mailq manpage_directory = /usr/local/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain mydomain = domain.com myhostname = mail4.domain.com mynetworks = 168.100.189.0/28, 127.0.0.0/8, 202.63.96.0/19 newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = no relay_domains = $mydestination sample_directory = /etc/postfix sendmail_path = /usr/sbin/sendmail setgid_group = postdrop unknown_local_recipient_reject_code = 450 Dec 26 11:32:53 mail4 postfix/smtpd[4606]: connect from localhost.localdomain[127.0.0.1] Dec 26 11:33:07 mail4 postfix/smtpd[4606]: 26C1D680067: client=localhost.localdomain[127.0.0.1] Dec 26 11:33:20 mail4 postfix/cleanup[4608]: 26C1D680067: message-id=<20061226060307.26C1D680067@generic> Dec 26 11:33:20 mail4 postfix/cleanup[4608]: file path name is: active/2/26C1D680067 Dec 26 11:33:20 mail4 postfix/qmgr[4604]: 26C1D680067: from=, size=362, nrcpt=1 (queue active) Dec 26 11:33:20 mail4 postfix/local[4610]: 26C1D680067: to=, relay=local, delay=13, status=bounced (Command died with status 127: "''". Command output: sh: : command not found ) Dec 26 11:33:20 mail4 postfix/cleanup[4608]: 96E52680079: message-id=<20061226060320.96E52680079@generic> Dec 26 11:33:20 mail4 postfix/cleanup[4608]: file path name is: active/9/96E52680079 Dec 26 11:33:20 mail4 postfix/qmgr[4604]: 96E52680079: from=<>, size=2070, nrcpt=1 (queue active) Dec 26 11:33:20 mail4 postfix/local[4610]: 96E52680079: to=, relay=local, delay=0, status=bounced (Command died with status 127: "''". Command output: sh: : command not found ) Dec 26 11:33:21 mail4 postfix/smtpd[4606]: disconnect from localhost.localdomain[127.0.0.1]