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You can find out your Postfix version by running

  oem@mail:/etc/init.d$ postconf -d | grep mail_version
  mail_version = 2.5.1
  milter_macro_v = $mail_name $mail_version

       -d     Print default parameter settings instead of actual settings.

       -e     Edit the main.cf configuration file. The file is copied to a temporary  file  then  renamed  into
              place.  Parameters  and  values are specified on the command line. Use quotes in order to protect
              shell metacharacters and whitespace.

FILES

       /etc/postfix/main.cf, Postfix configuration parameters

SEE ALSO

       bounce(5), bounce template file format
       postconf(5), configuration parameters

NAME

       postconf - Postfix configuration utility

SYNOPSIS

       postconf [-dhnv] [-c config_dir] [parameter ...]

       postconf [-aAmlv] [-c config_dir]

       postconf [-ev] [-c config_dir] [parameter=value ...]

       postconf [-btv] [-c config_dir] [template_file]

DESCRIPTION

The postconf(1) command displays the actual values of configuration parameters, changes configuration parameter values, or displays other configuration information about the Postfix mail system.

POSTFIX