[Rajkumar S <listuser@xxxxxxxxxxxxx>]

Hello all,

I am pretty new to tethereal, and wants to know about how to use filter 
expressions.

In order to check for outgoing spams from my network I use an command like

tethereal -t a  -ni eth0 port 25 and host not my.mail.server | grep 
"SMTP Command:"

reading through the tethereal man page, I get a feeling that the filter 
expressions can be used to achieve a much more powerful way to select 
what I want to see. But I am unable to figure out how to use read filter 
expressions. Basically I am bit confused with read filter expressions 
and capture filter expressions. Any clarifications or examples will be 
very much welcome.

TIA

raj