On Wed, 20 Aug 2003, Dennis Davis wrote:
> verify = recipient/callout=10s,defer_ok
>
> on the addresses in these domains to possibly stop the above
> happening.
You want recipient/defer_ok/callout=10s,defer_ok else I think you'll get
temporary errors for DNS problems, which isn't ideal for a MX relay.
I've actually found 10s is a bit too low, I've stuck on 20s.