Mark Goodge:
> > I've seen no evidence that this interpretation is correct. On what
> > basis do you assert that this is Yahoo's policy?
>
> Experience, mostly. I've found that ceasing retry attempts for four
> hours, then restarting, typically results in the queue clearing as fast
> as you can send the emails without any further errors being generated.
This could be automated outside of Postfix by tailing the maillog
file and updating the defer_transports setting (see Victor's post).
It requires a "postfix reload" command to restart the queue manager.
Wietse