Re: multiple relays in smtpd.conf

> On 2.Aug. 2017, at 14:09, Gilles Chehade <gilles@poolp.org> wrote:
>
> On Wed, Aug 02, 2017 at 01:47:09PM +0200, Kirill Miazine wrote:
>> * Eric Faurot [2017-08-02 13:24]:
>>> On Wed, Aug 02, 2017 at 11:44:47AM +0200, Christian Gut wrote:
>>>> Hi List,
>>>>
>>>> is it possible to have multiple relays (you might want to say smart hosts) in smtpd?
>>>>
>>>> I currently use the following line:
>>>>
>>>> accept from local for any relay via smarthost.example.org <http://smarthost.example.org/>
>>>>
>>>> Now I would like to have multiple smart hosts in there for backup reasons, if one of the smart hosts is in maintainance. Is something like this possible?
>>>>
>>>> accept from local for any relay via { smarthost1.example.org <http://smarthost1.example.org/>, smarthost2.example.org <http://smarthost2.example.org/> }
>>>>
>>>> Kind Regards,
>>>> Christian
>>>>
>>> It's not possible at the moment. There is ongoing work to support this feature,
>>> along with other improvements. But it's quite a big change, and we can't give an
>>> ETA right now.
>>
>> what about defining a new name in DNS containing addresses of all
>> smarthosts as a workaround for the OP for now?
>>
>
> This can work in some use-cases, this is exactly what a co-worker did to
> work around the limitation.

How will smtpd operate then? Does it use the DNS records in a round robin fashion or does it try them one after another if they fail?

Christian