postfix not delivering mail with error: postfix fatal: unsupported dictionary type: 19

Solution Verified - Updated -

Issue

  • postfix emails are not being relayed; receiving error messages in /var/log/maillog:

    Sep 25 15:29:02 hostname postfix/smtpd[20525]: fatal: unsupported dictionary type: 19
    Sep 25 15:29:03 hostname postfix/master[20267]: warning: process /usr/libexec/postfix/smtpd pid 20525 exit status 1
    Sep 25 15:29:03 hostname postfix/master[20267]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
    

Environment

  • Red Hat Enterprise Linux
  • postfix

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