Getting error message "MTA: cannot bind: Address already in use" and postfix cannot start in Red Hat Enterprise Linux 5 and 6

Solution Verified - Updated -

Issue

  • postfix service cannot start.
  • In RHEL5, the following error message was seen.
opendaemonsocket: daemon MTA: cannot bind: Address already in use: 11 Time(s)  
opendaemonsocket: daemon MTA: server SMTP socket wedged: exiting: 1 Time(s)

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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