Hi Chris, thanks again for the info.
It would be great to configure some sort of automatic smarthost failover.
I played around with the "fallback_hosts" option for transports and
routers, but it never attempts to send through these when there is a
failure on the main server (which I trigger by setting a non-existent
server, or a wrong password).
Any information on what would be the proper configuration will be
really appreciated! Thanks a lot
George
On Fri, Jan 31, 2014 at 4:18 PM, Chris Knadle <Chris.Knadle@???> wrote:
> On Thursday, January 30, 2014 20:31:30 George wrote:
>> Thanks Chris for your answer.
>>
>> What I wanted to achieve with this is that in case the external SMTP
>> is down, the user inmediately gets the bounce notification, regardless
>> if the mail is queued.
>
> I think you're not talking about a "bounce" per se then, as I believe that
> implies a permanent sending failure -- instead I think you're talking about
> the Exim temporary failure notifications.
>
>> If this happens, I want to be able to quickly change the relay server
>> to another one.
>
> That seems unusual but... okay.
>
> At some point you might want to look into setting up "alternate relayhosts"
> which I think you might be able to do by using manualroute for your "foo.com"
> domain.
>
> http://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_manualroute_router.html
>
> ... or some other way of "automatically" detecting that the smarthost is down
> and having the computer do this work for you, because detecting the problem,
> and shutting down mail to switch smarthosts sounds like it could get a bit
> tedious. Try to set things up so you can take a week's vacation when you get
> the chance to. ;-)
>
>> Let me tell you (and everybody), that I figured out a way to achieve
>> it: I set "errors_to = $sender_address_local_part" on the router
>> options, and "return_path = $sender_address" on the transport options.
>> That way if a delivery error occurs at router time (locally), the
>> bounce is delivered to the local mailbox, but if the message
>> sucessfully goes through the external SMTP it will have its return
>> path corretly set to the original address (handled by the transport
>> setting).
>
> I think I see. So by setting "errors_to = $sender_address_local_part", you're
> removing the domain name associated with only mail that gets returned so it
> ends up being local (which works if it's a user account or a known local
> alias), but if it gets transported successfully then you're setting the
> return_path back to the normal email address.
>
> That sounds like it should work okay.
>
> -- Chris
>
> --
> Chris Knadle
> Chris.Knadle@???
>
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