How to set lifetime for the mail stuck in the postfix queue ?

Solution Verified - Updated -

Issue

  • How to check the parameters which are used/loaded by postfix by default even if not configured in main.cf ?
  • How to check available options which can be defined in /etc/postfix/main.cf ?
  • How to change lifetime of the mails which are stuck in the queue ?

Environment

  • Red Hat Enteprise Linux (All Versions)
  • postfix

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