感謝學長~我去找了一夏rpm解開在cofg資料夾理面有main.cf檔 ，拿出來修改一些設定就可以了，不過有些地方需要註解掉才可以正常運作，在main.cf最下面
# sendmail_path: The full pathname of the Postfix sendmail command.
# This is the Sendmail-compatible mail posting interface.
#
sendmail_path =
# newaliases_path: The full pathname of the Postfix newaliases command.
# This is the Sendmail-compatible command to build alias databases.
#
newaliases_path =
# mailq_path: The full pathname of the Postfix mailq command. This
# is the Sendmail-compatible mail queue listing command.
#
mailq_path =
# setgid_group: The group for mail submission and queue management
# commands. This must be a group name with a numerical group ID that
# is not shared with other accounts, not even with the Postfix account.
#
setgid_group =
# html_directory: The location of the Postfix HTML documentation.
#
html_directory =
# manpage_directory: The location of the Postfix on-line manual pages.
#
manpage_directory =
# sample_directory: The location of the Postfix sample configuration files.
# This parameter is obsolete as of Postfix 2.1.
#
sample_directory =
# readme_directory: The location of the Postfix README files.
#
readme_directory =
把這些註解掉就運作OK了^^~
