我有以下MySQL用户和主机
远离root，用户'usern'是我的cPanel帐户用户名，用户（leechprotect，modsec，roundcube，cphulkd，eximstats）与cPanel相关（那些没有问题，因为它们只连接到'localhost'）。
其他7个帐户连接到多个mysql HOST 。 7个mysql用户（usern_an，usern_anup，usern_mup，usern_up，usern_upp，usern_vb，usern_vb3，usern_vbtu）中的每一个都连接到数据库。
mysql> SELECT User, Host FROM mysql.user;
+----------------+------------------------------+
| User | Host |
+----------------+------------------------------+
| usern | ip1.ip1.ip1.ip1 |
| usern_an | ip1.ip1.ip1.ip1 |
| usern_anup | ip1.ip1.ip1.ip1 |
| usern_mup | ip1.ip1.ip1.ip1 |
| usern_up | ip1.ip1.ip1.ip1 |
| usern_upp | ip1.ip1.ip1.ip1 |
| usern_vb | ip1.ip1.ip1.ip1 |
| usern_vb3 | ip1.ip1.ip1.ip1 |
| usern_vbtu | ip1.ip1.ip1.ip1 |
| root | 127.0.0.1 |
| usern | ip2.ip2.ip2.ip2 |
| usern_an | ip2.ip2.ip2.ip2 |
| usern_anup | ip2.ip2.ip2.ip2 |
| usern_mup | ip2.ip2.ip2.ip2 |
| usern_up | ip2.ip2.ip2.ip2 |
| usern_upp | ip2.ip2.ip2.ip2 |
| usern_vb | ip2.ip2.ip2.ip2 |
| usern_vb3 | ip2.ip2.ip2.ip2 |
| usern_vbtu | ip2.ip2.ip2.ip2 |
| usern | ip3.ip3.ip3.ip3 |
| usern_an | ip3.ip3.ip3.ip3 |
| usern_anup | ip3.ip3.ip3.ip3 |
| usern_mup | ip3.ip3.ip3.ip3 |
| usern_up | ip3.ip3.ip3.ip3 |
| usern_upp | ip3.ip3.ip3.ip3 |
| usern_vb | ip3.ip3.ip3.ip3 |
| usern_vb3 | ip3.ip3.ip3.ip3 |
| usern_vbtu | ip3.ip3.ip3.ip3 |
| usern | ip4.ip4.ip4.ip4 |
| usern_an | ip4.ip4.ip4.ip4 |
| usern_anup | ip4.ip4.ip4.ip4 |
| usern_mup | ip4.ip4.ip4.ip4 |
| usern_up | ip4.ip4.ip4.ip4 |
| usern_upp | ip4.ip4.ip4.ip4 |
| usern_vb | ip4.ip4.ip4.ip4 |
| usern_vb3 | ip4.ip4.ip4.ip4 |
| usern_vbtu | ip4.ip4.ip4.ip4 |
| usern | ip5.ip5.ip5.ip5 |
| usern_an | ip5.ip5.ip5.ip5 |
| usern_anup | ip5.ip5.ip5.ip5 |
| usern_mup | ip5.ip5.ip5.ip5 |
| usern_up | ip5.ip5.ip5.ip5 |
| usern_upp | ip5.ip5.ip5.ip5 |
| usern_vb | ip5.ip5.ip5.ip5 |
| usern_vb3 | ip5.ip5.ip5.ip5 |
| usern_vbtu | ip5.ip5.ip5.ip5 |
| usern | ip6.ip6.ip6.ip6 |
| usern_an | ip6.ip6.ip6.ip6 |
| usern_anup | ip6.ip6.ip6.ip6 |
| usern_mup | ip6.ip6.ip6.ip6 |
| usern_up | ip6.ip6.ip6.ip6 |
| usern_upp | ip6.ip6.ip6.ip6 |
| usern_vb | ip6.ip6.ip6.ip6 |
| usern_vb3 | ip6.ip6.ip6.ip6 |
| usern_vbtu | ip6.ip6.ip6.ip6 |
| root | ::1 |
| usern | c1server.domserverC.com |
| usern_an | c1server.domserverC.com |
| usern_anup | c1server.domserverC.com |
| usern_mup | c1server.domserverC.com |
| usern_up | c1server.domserverC.com |
| usern_upp | c1server.domserverC.com |
| usern_vb | c1server.domserverC.com |
| usern_vb3 | c1server.domserverC.com |
| usern_vbtu | c1server.domserverC.com |
| usern | gserver.domserverA.com |
| usern_an | gserver.domserverA.com |
| usern_anup | gserver.domserverA.com |
| usern_mup | gserver.domserverA.com |
| usern_up | gserver.domserverA.com |
| usern_upp | gserver.domserverA.com |
| usern_vb | gserver.domserverA.com |
| usern_vb3 | gserver.domserverA.com |
| usern_vbtu | gserver.domserverA.com |
| usern | iserver.domserverB.com |
| usern_an | iserver.domserverB.com |
| usern_anup | iserver.domserverB.com |
| usern_mup | iserver.domserverB.com |
| usern_up | iserver.domserverB.com |
| usern_upp | iserver.domserverB.com |
| usern_vb | iserver.domserverB.com |
| usern_vb3 | iserver.domserverB.com |
| usern_vbtu | iserver.domserverB.com |
| cphulkd | localhost |
| eximstats | localhost |
| usern | localhost |
| usern_an | localhost |
| usern_anup | localhost |
| usern_mup | localhost |
| usern_up | localhost |
| usern_upp | localhost |
| usern_vb | localhost |
| usern_vb3 | localhost |
| usern_vbtu | localhost |
| leechprotect | localhost |
| modsec | localhost |
| root | localhost |
| roundcube | localhost |
| usern | mserver.domserverA.com |
| usern_vb | mserver.domserverA.com |
| usern_vbtu | mserver.domserverA.com |
| root | mserver.domserverA.com |
| usern | server.domserverA.net |
| usern_vb | server.domserverA.net |
| usern_vbtu | server.domserverA.net |
| usern | server1.domserverD.com |
| usern_an | server1.domserverD.com |
| usern_anup | server1.domserverD.com |
| usern_mup | server1.domserverD.com |
| usern_up | server1.domserverD.com |
| usern_upp | server1.domserverD.com |
| usern_vb | server1.domserverD.com |
| usern_vb3 | server1.domserverD.com |
+----------------+------------------------------+
113 rows in set (0.00 sec)
实际上，只有ip1.ip1.ip1.ip1是我当前使用当前网络主机的IP 远离'localhost'和'ip1。'，其他的ips和服务器名称来自以前的web主机。
删除/删除那些“用户”@“主机”是否安全？