On Fri, May 29, 2009 at 09:10:14AM +0100, Paul Cocker wrote:
> I'm pretty sure that thus far I'm spot on, my only question now is
> whether or not I need to change the inet_interfaces setting in main.cf
> from all to 100.100.100.2, or whether this would prevent local systems
> from sending mail out via 100.100.100.1.
At a minimum, the union of "inet_interfaces" and "proxy_addresses"
needs to list all IP addresses at which you receive inbound email
(IP addresses of MX hosts for your domans, or A records of hosts
that receive user@host email). Email sent to user@[ip] is considered
"local" provided the "ip" is in inet_interfaces or proxy_addresses.
If "inet_interfaces" is then just a single IP address, but the system
is connected to multiple subnets, not just multi-IP on a single subnet,
then it is important to read the docs for "inet_interfaces" and understand
the notes about "smtp_bind_address".
Otherwise, also "inet_interfaces" is used in the default value of:
local_header_rewrite_clients = permit_inet_interfaces
and of course the default address list for master.cf "inet" services
that only specify a service name, with no address.
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