On Fri, May 06, 2011 at 05:53:13PM -0500, CT wrote:
> mynetworks = hash:/etc/postfix/network_table
> 
> After much looking and I surmise the format should be
> 192.168.1.2 OK   (a space between IP and "OK")
> "should work"..

For hash: or cidr: (see cidr_table(5)), yes.

> and that CIDR
> 192.168.1.0/24 OK   (a space between IP and "OK")
> does not work.

For hash:, no, won't work; for cidr:, yes, it will.

    http://www.postfix.org/DATABASE_README.html

> In my test  the "single IP" did not work either..
> 
> May 6 17:30:03 mailhost postfix/smtpd[30135]: NOQUEUE: reject: RCPT 
> from host.example.com [162.198.1.2]: 554 5.7.1 <[email protected]>: 
> Relay access denied;

Not enough information to answer, but there is a strong hint that 
munging took place: 162.198.1.2 != 192.168.1.2. (Why would you mung 
RFC1918 addresses?)

    http://www.postfix.org/DEBUG_README.html#mail
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