plesk 12.0.18 Update #96 OS: Ubuntu 14.04.3 LTS plesk を介して fail2ban をインストールしましたが、何らかの理由で postfix サーバーでの試行の失敗をブロックしていません。
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
iptables を介してこの ip myslef をブロックする必要がありました -fail2ban のログを確認すると、ip をブロックしようとしたことを示すものさえ何もありません。