Charles Amstutz:
> Hi everyone,
> 
> I'm seeing that you can move the trusted networks (mynetworks) in
> main.cf  from a single line to a file.   My question is this: in
> the file format,  is it one IP per Line or do you still put It on
> one line seprating out by commas?  Also, is it safe to put comments
> in that file? I'd like to document which IP is what.

As documented it depends on the kind of file.

> I know these are basic questions, but looking for answers.

Quoting from http://www.postfix.org/postconf.5.html#mynetworks

In main.cf:

    Specify a list of network addresses or network/netmask patterns,
    separated by commas and/or whitespace. Continue long lines by
    starting the next line with whitespace.

    The netmask specifies the number of bits in the network part
    of a host address.

    You can also specify "/file/name" or "type:table" patterns.

In a "/file/name" 

    A "/file/name" pattern is replaced by its contents. So the
    contents have the same format as main.cf.

    In the examples section, this is shown as
    "mynetworks = $config_directory/mynetworks"

In a  "type:table"

    A "type:table" lookup table is matched when a table entry matches
    a lookup string (the lookup result is ignored).

    In the examples section, this is shown as
    "mynetworks = hash:/etc/postfix/network_table".

The description assumes that you know how to use hash: and other
Postfix lookup tables.

        Wietse
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