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[oracle@dbsvr ~]$
{
echo "Subject: [192.168.0.123] SSH Login Waring `date +%Y/%m/%d\ %H:%M:%S`"
echo
cat /tmp/sec.log
} | ssmtp id@mailserver
ssmtp: 450 4.7.1 Error: too much mail from 192.168.0.123
mailserver# tail /var/log/maillog
May 26 22:34:34 localhost postfix/smtpd[13404]: connect from unknown[192.168.0.123]
May 26 22:34:34 localhost postfix/smtpd[13404]: warning: Message delivery request rate limit exceeded: 6 from unknown[192.168.0.123] for service smtp
May 26 22:34:34 localhost postfix/smtpd[13404]: lost connection after MAIL from unknown[192.168.0.123]
May 26 22:34:34 localhost postfix/smtpd[13404]: disconnect from unknown[192.168.0.123]