from
http://www.postfix.org/basic.html#mynetworks;
My own networks
The mynetworks parameter lists all networks that this machine somehow trusts. This information can be used by the anti-UCE features to recognize trusted SMTP clients that are allowed to relay mail through Postfix.
You can specify the list of trusted networks in the main.cf file, or you can let Postfix deduce the list for you. The default is to let Postfix do the work for you.
Default:
mynetworks_style = subnet
The meaning of the styles is as follows:
class
Trust SMTP clients in the class A/B/C networks that Postfix is connected to. Don't do this with a dialup site - it would cause Postfix to "trust" your entire provider's network. Instead, specify an explicit mynetworks list by hand, as described below.
subnet (default)
Trust SMTP clients in the IP subnetworks that Postfix is connected to.
host
Trust only the local machine.
Alternatively, you can specify the mynetworks list by hand, in which case Postfix ignores the mynetworks_style setting. To specify the list of trusted networks by hand, specify network blocks in CIDR (network/mask) notation, for example:
mynetworks = 168.100.189.0/28, 127.0.0.0/8
You can also specify the absolute pathname of a pattern file instead of listing the patterns in the main.cf file
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so, just specify the "mynetworks" by hand.
by the way, when I use the resolveip command on that ip address you are having trouble with, the output is:
$ resolveip 208.63.55.118
resolveip: Unable to find hostname for '208.63.55.118'.
I know that in sendmail, I usually run into this type of thing. I fix it with the masquerading options.
Joel
