On Mon, 2005-07-11 at 10:09 +0700, Saran Toochinda wrote:
> Hi,
> I have set up postfix as a gateway mail relay on a linux box at our office.
> This gateway only connect to the internet during office hours and has no DNS
> record anywhere. Initially I configure it to send mail directly to the
> internet without using any intermediate host. It's work fine for most of our
> client's mail servers. However, some of them refuse our mail because it
> can't find reverse DNS records of our mail gateway. So I have to use
> relayhost for these client's (using transport_maps). I used to use 'MDaemon'
> mail server on W2K machine, it has a nice option saying that 'delivery
> undelivered mail to this host if it can't directly send for any reason'.
I think that's what
fallback_relay (default: empty)
Optional list of relay hosts for SMTP destinations that can't be
found or that are unreachable.
By default, mail is returned to the sender when a destination is
not found, and delivery is deferred if a destination is
unreachable.
The fallback relays must be SMTP destinations. Specify a domain,
host, host:port, [host]:port, [address] or [address]:port; the
form [host] turns off MX lookups. If you specify multiple SMTP
destinations, Postfix will try them in the specified order.
Note: do not use the fallback_relay feature when relaying mail
for a backup or primary MX domain. Mail would loop between the
Postfix MX host and the fallback_relay host when the final
destination is unavailable.
* In main.cf specify "relay_transport = relay",
* In master.cf specify "-o fallback_relay =" (i.e., empty)
at the end of the relay entry.
* In transport maps, specify "relay:nexthop..." as the
right-hand side for backup or primary MX domain entries.
These are default settings in Postfix version 2.2 and later.
Is for.
>
> This option is best suite for our need cause we try to avoid intermediate
> host usage but if we can't avoid it then use it as need but not being used
> it for all.
> My question is, is there a way to do this in postfix? As I can see, when
> remote server say '533 invalid sender' postfix simply bounce the message.
As it should. A permanent error is supposed to be bounced.
--
Daniel J McDonald, CCIE # 2495, CNX, CISSP # 78281
Austin Energy
[EMAIL PROTECTED]
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