This problem was resolved off-list.
Greg Sims:
> Wietse & Viktor,
>
> All is not lost. Restarting BIND on Ray08 solved the problem of
> c=30!! I am sorry that I did not review/restart this service earlier.
> Your comments related to the 5 second intervals and DNS timeouts
> caused me to look there.
Unfortunately we went down some dead ends because I missed that
the Postfix SMTP client will make DNS MX and address queries even
when reusing connections. I am updating Postfix documentation.
With the crippled DNS resolver, the Postfix 'type c' delays were
dominated by the number of DNS lookups. This resulted in larger
delays for domains with many MX records such as gmail.com, compared
to domains with fewer MX records such as yahoo.com or outlook. These
differences in delays were not the result of receiver-side throttling.
Wietse
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