If the flag is enabled and the mail owner has Designer or Manager level access, this flag has no effect.
如果标志被启用，并且邮件所有者具有设计者或管理者级别的权限，则该标志没有意义。
To back up your mail using ifrom, just give it the -backup flag.
要使用ifrom备份邮件，只需对它使用- backup标志。
The –q flag specifies the interval at which the Sendmail daemon processes saved messages in the mail queue.
–q 标志指定 Sendmail 守护进程在邮件队列中保存邮件的时间间隔。
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