Why does sendmail fail with "sendmail dead but subsys locked" in Red Hat Enterprise Linux 6?

Solution Unverified - Updated -

Issue

  • Unable to use sendmail in Red Hat Enterprise Linux 6

  • Getting below output in sendmail status:

# service sendmail status
sendmail dead but subsys locked
sm-client (pid  6113) is running...

Environment

  • Red Hat Enterprise Linux 6
  • Sendmail

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