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helo
2015 Jun 23
0
OT Advantage of running DNS server?
...e are some services that are particularly sensitive to DNS
resolver time. SMTP MTA and MDA services are notoriously sensitive to
DNS delays and configuration errors. It a standard practice to run a
caching only DNS resolver service on SMTP MTA's simply to answer
requests generated by the HELO/EHELO verification processes. A
caching only resolver does what its name implies. It only handles
requests generated on the local host and it caches those answers for
future reuse by that host.
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