Hello,
addresses the delicate problem :-) The customer has on our mailserver
your domain, there about 10 mailboxes. The problem is that the
connections are constantly on the pop3/imap/smtp
ran...@customerdomain.cz. That sometimes appears the attack is normal,
but this problem more than a month, for example, now over 12 hours we
have more than 340 000 invalid login (or attempting to them) to an
invalid address.
I installed fail2ban, but the problem persists, the majority of the IP
request comes just a few.
Can someone have a solution?
m.
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