Security question on mass login attempts

I run a daily security log via cron that sends me an email daily showing me any suspecious activity and who accessed the system. Im starting to get this in the log now at least 50-100 time ever so often:

Failed logins from these:
admin1/password from ipaddremoved: 4 Time(s)
admin2/password from ipaddremoved: 4 Time(s)
admin3/password from ipaddremoved: 4 Time(s)
adrian/password from ipaddremoved: 4 Time(s)
alden/password from ipaddremoved: 4 Time(s)
andrew/password from ipaddremoved: 4 Time(s)

I mean from a-z, so obviously some bot is out there trying to find logins. I recently switched to APF and though I could block this ip, instead of doing it automatically as Im sure the ips will change is there a setting in APF that I can turn on that will help stop this problem?

Thanks
Silly

 

 

 

 

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