啓動sendmail出錯/etc/mail/sendmail.cf: line 39: unknown configuration line

   配置sendmail時，修改sendmail.mc,如果將配置語句沒有頂格寫，容易出現問題，如下：
[root@localhost mail]# service sendmail restart
Shutting down sendmail:                                    [  OK  ]
Shutting down sm-client:                                   [  OK  ]
Starting sendmail: 554 5.0.0 /etc/mail/sendmail.cf: line 39: unknown configuration line ”
”
                                                           [FAILED]
Starting sm-client:                                        [  OK  ]

  如果出現以上錯誤，只要將sendmail.mc中的配置語句頂格寫，後重新執行m4 sendmail.mc > sendmail.cf後，執行service sendmail restart或 執行 newaliases生成新的別名記錄文件，就不會出現以上錯誤了！