Many Anomaly messages, particularly Mailserver.

Hi all,

I have here many Anomaly messages because of our Mailserver.
Is the normal? Can I affect these somewhere?

192.168.1.51 = Mailserver internal
192.168.1.50 = ASL

Details about the intrusion alert:

Message........: Closed dest port used: local dest, teardown flags: 1.0000 
Time...........: 2005:05:22-07:00:02
Packet dropped.: no
IP protocol....: 6 (TCP)

Source IP address: 192.168.1.51
http://www.dnsstuff.com/tools/ptr.ch?ip=192.168.1.51
http://www.ripe.net/perl/whois?query=192.168.1.51
http://ws.arin.net/cgi-bin/whois.pl?queryinput=192.168.1.51
http://cgi.apnic.net/apnic-bin/whois.pl?search=192.168.1.51
Source port: 25 (smtp)
Destination IP address: 192.168.1.50 (ASL)
http://www.dnsstuff.com/tools/ptr.ch?ip=192.168.1.50
http://www.ripe.net/perl/whois?query=192.168.1.50
http://ws.arin.net/cgi-bin/whois.pl?queryinput=192.168.1.50
http://cgi.apnic.net/apnic-bin/whois.pl?search=192.168.1.50
Destination port: 56903

Stefan
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