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== Determine Installed Version ==If postfix is running and the main.cf specifies smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)you can telnet localhost 25If postfix is not running you can check by the package.There is no version switch on the postfix binary. Here are some ways you can determine what version of postfix is installed:Redhat/Fedora/CentOS: rpm -qa postfixDebian/Ubuntu: dpkg -s postfix