> On Jul 14, 2017, at 8:40 AM, Tom Hudson <tom.hud...@giacom.com> wrote:
>
> Thank you for all of your help so far with this issue.
>
> Just to let you know, the problem appears to have been caused by the
> "daemon_timeout" being set far too low during our initial configuration. I
> know the default in postfix is 18000s but ours had been set to 60s!
> Increasing this to 600s appears to have caused the problem to go away.
>
> Again, thank you all for your help.
Even 600s is far too short. This is a last resort safety mechanism that
should never happen, not an routine operational timeout. Set it to at
least 1 hour, or better yet, just leave at the default 5 hours.
--
Viktor.
