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[9.107-33] SMTP -failed logins

Hi All

Lately I am getting a lot of "too many login failed" messages such the one attached. I am trying to find why this is happening. I have enabled the blocking mechanism as per Definitions & Users>Authentication Servers>Advanced so when there is a failed login message I will get notified. However relaying is only allowed  for specific users (email protection>smtp>relaying) and I am allowing only internal network 

The ip as per attached notification are random(to name a few):
174.79.39.4
85.52.224.140
78.98.72.175 

As I don't have an open relay I am not sure why this is happening

Thanks


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