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Memory corruption error appears on the server console or in the maillog

Symptoms

  • Memory corruption error appears on the server console or in the maillog.
  • MDC crash errors in/var/log/maillog


  mithiMDC : malloc() memory corrupted.

Cause

Memory corruption error occurs if autoreply is enabled for system users like postmaster, catchall etc.

Enabling autoreply generates unnecessary mail traffic which may result various problems in mail flow.

Resolution

The autoreply should not be enabled for the system users.

Disabling autoreply resolves the problem.