New brute-force mail password guesser on the block: "CIPHER OPERATIONS DOO BEOGRAD - NOVI BEOGRAD is a company based in Belgrade, Serbia, engaged in information technology and cybersecurity services."
I added all his address ranges to my firewall (AS215930):
185.37.195.0/24
81.30.107.0/24
62.60.130.0/24
cc @homelab @homelab_de as FYI for fellow mail server admins
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