On Wed, Feb 23, 2011 at 11:49:34AM -0800, Robert Goodyear wrote:
> > Postfix remembers dead destinations, not dead hosts. When a live
> > destination is served by hosts a subset of which are down, demand
> > connection caching kicks in under load and reduces the frequency
> > of (probabilistically slow) connection attempts.
>
> I guess I'm most interested in what happens when a backoff response is
> sent back from my edge (relayhost/smarthost) MTA to my origin MTA.
I don't know what a "backoff response" means. There is no such term
defined in the SMTP RFC.
> Since this is not a dead MX we're talking about, I'm trying to understand
> the negotiation and see if rapidly-expiring internal DNS TTL would actually
> _do_ anything or just shake up the randomization, which is pointless.
What negotiation? What problem are you trying to solve?
--
Viktor.
