The documentation for postfix states that the default for mynetworks parameter is "mynetworks_style = subnet" and that this "Trust SMTP clients in the IP subnetworks that Postfix is connected to."
In Postfix 2.0.4, etc/main.cf says:
# By default (mynetworks_style = subnet), Postfix "trusts" SMTP # clients in the same IP subnetworks as the local machine. # On Linux, this does works correctly only with interfaces specified # with the "ifconfig" command.
Now, the machine that postfix sits on is connected to two networks (external and internal).
External is 210.23.146.0/?? and internal 192.168.100.0/24
If I leave the default settings, will other members of our service provider be able to use our machine as a mail relay? (Ie. those coming in off 210.23.146.0 network?)
AFAICT, maybe .... not real sure on this
I guess the obvious solution is to just specify "mynetworks = 192.168.100.0/24, 127.0.0.0/8" and I won't have to worry, but I'm curious about if this is really necessary (and correct).
This is correct.
cheers, Rob
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