On Wed, Oct 18, 2000 at 03:30:22PM +0300, Igor Karpov wrote:
> I want to setup one host as a mail exchanger for a couple of
> subdomains, which which are located in 10.x.x.x subnets. This host,
> surely, must be visible from the whole Internet and all MX records
> for these subdomains should point to it.
> When mail arrived for domain itself, it should be treated as local;
> when mail is for the one of these subdomains, it must be routed to
> another host, running primary DNS for all these subdomains and,
> therefore, knowing exactly where to send this mail.
OK, so this is the way that occurs to me- let's say initially that the
mail domain in question is example.com, your visible mail exchanger is
mx.example.com and your 10.x.x.x mail hub is hub.example.com.
On mx.example.com:
>>>
# main config
local_domains=example.com
# transports
example_smtp:
driver=remote_smtp
hosts=hub.example.com
# directors:
example_domain:
driver=smartuser
domains=example.com
transport=example_smtp
no_more # I think this is redundant
# routers:
# no extra config necessary.
>>>
And then hub.example.com is a fairly typical mail setup.
To generalise to /etc/exim/private_domains.cdb containing keys for
each domain:
>>>
# main config
local_domains=cdb;/etc/exim/private_domains.cdb
# transports
example_smtp:
driver=remote_smtp
hosts=hub.example.com
# directors:
example_domain:
driver=smartuser
domains=cdb;/etc/exim/private_domains.cdb
transport=example_smtp
no_more # I think this is redundant
# routers:
# no extra config necessary.
>>>
An alternative:
>>>
# main config
relay_domains = cdb;/etc/exim/private_domains.cdb
# or set relay_domains_include_local_mx
# transports
# nothing new here
# directors
# nothing new here
# routers
private_domains:
driver = domainlist
transport = remote_smtp
route_list = "cdb;;/etc/exim/private_domains.cdb hub.example.com bydns_a"
>>>
On reflection, the router-based solution looks neater. (NB the double
semicolon is route_list is intentional)
HTH
SRH
--
+ Steve Haslam | W: +44-20-7447-1839 +
+ Production Engineer, Excite UK | M: +44-7775-645618 +
. NP: Kryptonite (3 Doors Down) .
