有人在扫描我的邮件服务器。
我能做些什么来阻止他们？
我尝试添加这个并没有帮助：
/etc/hosts.deny
ALL: 80.82.77.18
我在日志中看到这个：
...
Aug 23 03:34:40 auth-worker(1664): Info: sql(torcac@example.net,80.82.77.18): unknown user (given password: torcac)
Aug 23 03:35:17 auth-worker(1664): Info: sql(roselia@example.net,80.82.77.18): unknown user (given password: roselia)
Aug 23 03:35:56 auth-worker(1664): Info: sql(japan@example.net,80.82.77.18): unknown user (given password: japan)
Aug 23 03:36:35 auth-worker(1664): Info: sql(berta@example.net,80.82.77.18): unknown user (given password: berta)
Aug 23 03:37:08 auth-worker(1664): Info: sql(blue,193.169.252.176): unknown user (given password: 123456)
Aug 23 03:37:12 auth-worker(1664): Info: sql(keely@example.net,80.82.77.18): unknown user (given password: keely)
Aug 23 03:37:49 auth-worker(1664): Info: sql(marcelia@example.net,80.82.77.18): …