how to see my_networks check in peer_debug, level 2 or greater?

[lconrad]

postconf mail_version
mail_version = 2.3.3


uname -a
Linux .....  2.6.18-128.2.1.el5 #1 SMP Wed Jul 8 11:54:47 EDT 2009 
x86_64 x86_64 x86_64 GNU/Linux

got an "access denied" for an IP that is in a /20 postconf confirms is 
in mynetworks

the only match_hostname I see is for 
smtpd_client_event_limit_exceptions

Thanks
Len