Hi,
I have already created rule below
netsh advfirewall firewall add rule name="NETRule8/04/2021 14:16:37_1" dir=in action=block remoteip=5.188.1.1-5.188.255.255
but such IP 5.188.206.246 is still creating bad activities on Email server like
2021-04-08 20:21:14 htwnmmiqwvpt@ump.gwdg.de operations@my???????.?? 5.188.206.246 127.0.0.1 SMTP ? 550 0
2021-04-08 20:21:38 qplaiebpykgy@ump.gwdg.de oyqjaafslj@my???????.?? 5.188.206.246 127.0.0.1 SMTP ? 550 0
2021-04-08 20:51:00 vzumobgvjdb@lighthouseapostolicchurch.net acnfrkbnwx@my???????.?? 5.188.206.246 127.0.0.1 SMTP ? 550 0
how to protect the server well?




