Providers beware Email brute forece attack

Just a warning for all providers we have noticed over the past week that there is a sophisticated brute force scheme going round which circumvents csf brute force, BFD,
etc, protection on email accounts.
Random IP’s brute forcing email accounts just watching the mail logs on one attempt.
Attacks coming from an unique ip every couple of seconds
I tried see how many there were it is 100's of residential IP’s form all over the world form hacked PC’s .
 
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