On 9 Feb 2016, at 14:29, Konstantin Boyandin <[email protected]> wrote: > The above Exim behaviour has happened just few times. Nameservers' > responses are being monitored 24/7 and they didn't show any quirks.
With the same granularity that Exim has? Are the resolvers the same in each case? > Question: does Exim uses /etc/hosts records (as specified in > /etc/nsswitch.conf ) before trying DNS resolution? Looks like it doesn’t. Not for an MX record, no - there’s no way to indicate an MX in /etc/hosts. It *might* drop back to that for A lookups, depending on the lookup order in /etc/nsswitch.conf. Graeme
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