StatusDnsQueryFailed resolving domain

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If you are seeing the following error in PowerMTA or Postfix logs :

StatusDnsQueryFailed resolving domain

It’s likely caused by 3 reasons :

  1. The requested domain does not exist. It doesn’t have neither MX nor A record.
  2. The upstream DNS provider is throttling excessive queries from your mail server.
  3. You are hitting bandwidth limits on either WAN(if the dns resolver request is going out via internet interface).

As always, i highly recommend to use dedicated recursive DNS server on LAN for your mailing infrastructure or use unthrottled upstream DNS resolver.

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