using a mynetworks file
tg
Postfix version 2.5.1
I'm trying to improve the protection of my mail server from hijack by
spammers. I understand one can restrict a node's access to a postfix
mail server by using:
mynetworks ='config-directory'/mynetworks
in the mail.cf file.
And I know that in the 'mynetworks' file you can specify the IP address
of the machine that's allowed to to send, but I was wondering if there
are other criteria you can use in the file besides an IP address. ie:
can you specify a machine by it's mac address? or computer name? maybe
the email address used by the node? And if so, what is the correct
format?
Thanks for any pointers.
Martin Gregorie
http://www.postfix.org/postconf.5.html and scroll down....
--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |
tg
"Martin Gregorie" <mar...@see.sig.for.address.invalid> wrote in message
news:gc5ab3$g08$1...@localhost.localdomain...
> On Fri, 03 Oct 2008 00:27:13 +0100, tg wrote:
>
> http://www.postfix.org/postconf.5.html and scroll down....
thanks for your response.
I did go to the page and scroll down but I didn't see anything except
references to IP addresses.
Martin Gregorie
That's about all that you can usefully use, plus anything that will
resolve to a hostname [1].
Domain names generally won't resolve unless the domain refers to a single
IP. The short-hand for a network is the CIDR form, which requires a
partial IP, e.g. 192.168.0.0/16 and its the easiest way to specify a
subnet: you could list individual hosts but that could easily get long-
winded and is error-prone. A single CIDR subnet reference is a lot easier
to maintain than a list of hostnames.
[1] I haven't tried this but it will probably work seeing that you can
use host names as well as IPs in other places.