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any ip adress are in fail2ban with the status blocked, and also in the ip tables ( per SSH added), but in the sys-log in plesk i can see the ip again with hacking activities, is this normal ?
If IP-address is blocked by a firewall, you shouldn't see hacking activities in logs at the same time.
Maybe ban was temporary and activities start again after unblock or IP-addresses every time is different.
Feb 1 14:17:45 plesk_saslauthd[16120]: No such user 'service@xxx' in mail authorization database
Feb 1 14:17:45 plesk_saslauthd[16120]: failed mail authenticatication attempt for user 'service@xxxxx' (password len=25)
Feb 1 14:17:45 postfix/smtpd[15879]: warning: 220.ip-x-x.eu[xxxxxxxx]: SASL LOGIN authentication failed: authentication failure
I suggest check firewall and firewall rules. Is it really active and really filter traffic from the IP-address? Fail2ban does not ban by itself, it is use system's firewall for that.