tail -n 1000 /var/log/mail.warn | grep -C 3 smtp | more
Jul 12 09:37:28 h1673007 postfix/smtpd[13227]: warning: 203.112.218.40: address not listed for hostname mail.sparkbd.com
Jul 12 09:37:33 h1673007 dk_check[13696]: DK_STAT_NOSIG: No signature available in message
Jul 12 09:37:33 h1673007 postfix/smtpd[13648]: warning: 59.165.107.50: hostname 59.165.107.50.static-chennai.vsnl.net.in verification failed: Name or service not known
Jul 12 09:37:34 h1673007 dk_check[13700]: DK_STAT_NOSIG: No signature available in message
Jul 12 09:38:02 h1673007 dk_check[13716]: DK_STAT_NOSIG: No signature available in message
Jul 12 09:38:02 h1673007 pop3d: 1278920282.377458 LOGOUT,
[email protected], ip=[87.79.70.46], top=0, retr=3514, time=2, rcvd=50, sent=3790, maildir=/var/qmail/mailnames/customersdomain.de/info/Maildir