Linux 由于错误，无法激活sendmail

我在Fedora 21服务器安装中安装了sendmail，但当我启动它并检查其状态时，我得到以下信息：

[root@localhost mail]# systemctl status sendmail
● sendmail.service - Sendmail Mail Transport Agent
   Loaded: loaded (/usr/lib/systemd/system/sendmail.service; enabled)
   Active: failed (Result: resources) since Thu 2015-06-04 11:23:31 CEST; 2min 39s ago
  Process: 31776 ExecStart=/usr/sbin/sendmail -bd $SENDMAIL_OPTS $SENDMAIL_OPTARG (code=exited, status=0/SUCCESS)
  Process: 31766 ExecStartPre=/etc/mail/make aliases (code=exited, status=0/SUCCESS)
  Process: 31763 ExecStartPre=/etc/mail/make (code=exited, status=0/SUCCESS)

Jun 04 11:23:31 localhost.localdomain sendmail[31776]: -bd is not supported by sSMTP
Jun 04 11:23:31 localhost.localdomain systemd[1]: Failed to start Sendmail Mail Transport Agent.
Jun 04 11:23:31 localhost.localdomain systemd[1]: Unit sendmail.service entered failed state.
Jun 04 11:23:31 localhost.localdomain systemd[1]: sendmail.service failed.

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这里有什么问题？我认为sSMTP不支持

-bd

是一个提示。但是我也找不到这方面的任何东西。

sSMTP是一个只发送sendmail的仿真器。当作为守护进程运行时，它不支持-bd选项（请参阅“manssmtp”）。F21中当前的sendmail是ssmtp的别名。您需要完全从F21中删除ssmtp（yum-erase-ssmtp）。

ssmtp是一个仅发送的sendmail仿真器。当作为守护进程运行时，它不支持-bd选项（请参阅“manssmtp”）。F21中当前的sendmail是ssmtp的别名。您需要完全从F21中删除ssmtp（yum-erase-ssmtp）