Hello Janardhan,
You can configure the ASA to send Syslog messages via email when xxx action happens.
Logging enable
logging list Outside_In_alerts message xxxxx
logging list Outside_In_alerts message xxxxx
logging list Outside_In_alerts message xxxxx
logging list Outside_In_alerts message xxxxx
Logging mail Outside_In_alerts
logging recipient-address destination@xxx.com
logging from-address xxx@example.com
smtp-server xxx.xxx.xxx.xxx ( you will need a SMTP server when you send the syslog messages in e-mails)
You will need to define the syslog messages you want to monitor (Access-list deny a packet on the outside interface, no xlate for inbound connections,etc)
Here are two documents you can use to understand this on a better way:
1-Syslog messages ID
http://www.cisco.com/en/US/docs/security/asa/asa80/system/message/logsevp.html
2-Syslog configuration on your ASA
http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/monitor_syslog.html#wp1064823
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00805a2e04.shtml
Let me know if this is what you are looking for,
Please rate helpful posts,
Regards,
Julio!!
Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC