Sendmail getting the error "Name server timeout"

Solution Verified - Updated -

Issue

  • We experience delay in our mail server
  • Some of our email is going directly to the waiting queue
  • We can see the following error in the /var/log/maillog.
Jul  2 10:03:09 myserver sendmail[31185]: s62228of031185: --- 451 google.com: Name server timeout
Jul  2 10:03:09 myserver sendmail[31185]: s62228of031185: --- 050 <user@go0gle.com>... Transient parse error -- message queued for future delivery

Environment

  • Red Hat Enterprise Linux 6
  • Sendmail

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