Logs: Apr 28 08:36:00 backup postfix/pickup[12743]: 7B13D9A067: uid=1000 from= Apr 28 08:36:00 backup postfix/cleanup[12815]: 7B13D9A067: message-id=<20110428133600.GA12801@austin.bio-west.com> Apr 28 08:36:00 backup postfix/qmgr[12744]: 7B13D9A067: from=, size=435, nrcpt=1 (queue active) Apr 28 08:36:00 backup postfix/smtp[12817]: 7B13D9A067: to=, relay=smtp.sbcglobal.yahoo.com[68.142.198.11]:587, delay=0.27, delays=0.01/0.01/0.22/0.04, dsn=5.0.0, status=bounced (host smtp.sbcglobal.yahoo.com[68.142.198.11] said: 553 From address not verified - see http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html (in reply to MAIL FROM command)) Apr 28 08:36:00 backup postfix/cleanup[12815]: CFBE69A06B: message-id=<20110428133600.CFBE69A06B@austin.bio-west.com> Apr 28 08:36:00 backup postfix/bounce[12818]: 7B13D9A067: sender non-delivery notification: CFBE69A06B Apr 28 08:36:00 backup postfix/qmgr[12744]: CFBE69A06B: from=<>, size=2515, nrcpt=1 (queue active) Apr 28 08:36:00 backup postfix/qmgr[12744]: 7B13D9A067: removed Apr 28 08:36:01 backup postfix/smtp[12817]: CFBE69A06B: to=, relay=smtp.sbcglobal.yahoo.com[68.142.198.11]:587, delay=0.16, delays=0/0/0.13/0.02, dsn=5.0.0, status=bounced (host smtp.sbcglobal.yahoo.com[68.142.198.11] said: 501 Syntax error in arguments (in reply to MAIL FROM command)) Apr 28 08:36:01 backup postfix/qmgr[12744]: CFBE69A06B: removed postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = loopback-only inet_protocols = ipv4 mailbox_command = mailbox_size_limit = 0 mydestination = localhost myhostname = austin.bio-west.com mynetworks = 127.0.0.0/8 10.1.1.0/24 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = [smtp.sbcglobal.yahoo.com]:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache