>         # Allow TCP through if setup succeeded
>         ${fwcmd} add pass tcp from any to any established
>         # Allow setup of incoming email
>         ${fwcmd} add pass tcp from any to ${ip} 25 setup
> I checked man page of ipfw ; setup matches packets have SYN bit or not
> .... 
> Upper rule is accepting setuped connections that ok ( please correct if
> I wrong ) 
>       Question is Why I need to set setup options on secound rule ...
> I mean I must to open 25 ( smtp port ) to all What is the setup option
> role ... 

You're right; given the first rule, the "setup" qualifier on the
second is redundant.  [I like to leave it in as a reminder to the
human reading the rules, though.]
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