On Wed, Dec 31, 2008 at 05:38:33PM +0000, Andrew Hodgson wrote:
> I am trying to find the answer whether Postfix will support multiple
> smarthosts - i.e, sending to specific smarthosts, and if one fails, it
> will try to send to the next one in the list, or will just use any
> smart host in the list without issue?
Season to taste:
/etc/postfix/main.cf:
relayhost = example.com
/etc/named.conf:
options {
directory "/var/named/data";
};
zone "example.com" in {
type master;
file "example.com";
};
/var/named/data/example.com
$TTL 2D;
@ IN SOA a.ns.example.com hostmaster.example.com (
1 ; Serial
10800 ; Refresh after 3 hours
3600 ; Retry after 1 hour
604800 ; Expire after 1 week
3600 ) ; Minimum TTL of 1 hour
@ IN NS a.ns
@ IN NS b.ns
a.ns IN A 192.0.2.1
b.ns IN A 192.0.2.2
@ IN MX 0 a.mx
@ IN MX 1 b.mx
@ IN MX 2 c.mx
a.mx IN A 192.0.2.3
b.mx IN A 192.0.2.4
c.mx IN A 192.0.2.5
Non-local mail is sent to "a.mx.example.com" if that fails, it is sent
to "b.mx.example.com" and finally "c.mx.example.com", or you can adjust
the MX preferences to be equal to get stastical load-balancing.
Alternatively, if all SMTP deliveries go to the smarthost, and you
don't want to or can't change DNS:
relayhost = [a.mx.example.com]
smtp_fallback_relay = [b.mx.example.com], [c.mx.example.com]
you can adjust the master.cf file to specify different SMTP fallback relay
lists for different (e.g. "smtp unix" vs. "relay unix") SMTP transports.
--
Viktor.
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