我有 plesk 12.0.18 更新 #96 操作系统：Ubuntu 14.04.3 LTS 我已经通过 plesk 安装了 fail2ban，由于某种原因，它没有阻止在 postfix 服务器上的失败尝试。
Dec 20 08:34:53 website postfix/smtpd[6696]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:34:56 website postfix/smtpd[27244]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:35:00 website postfix/smtpd[7415]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:35:32 website postfix/smtpd[6582]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:35:35 website postfix/smtpd[29514]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:35:41 website postfix/smtpd[6582]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:03 website postfix/smtpd[6582]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:06 website postfix/smtpd[6696]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:09 website postfix/smtpd[27244]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:15 website postfix/smtpd[6696]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:21 website postfix/smtpd[6696]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:24 website postfix/smtpd[27244]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
Dec 20 08:36:27 website postfix/smtpd[6696]: warning: unknown[37.216.243.35]: SASL LOGIN authentication failed: authentication failure
我不得不通过 iptables 阻止这个 ip myslef -我在检查 fail2ban 的日志时，那里没有任何内容甚至显示试图阻止 ip。