a typical csf+lfd error notice

lfd on host.puthi.com: blocked 77.247.110.11 (NL/Netherlands/-)

Time:     Thu Mar 25 10:42:27 2021 +0530
IP:       77.247.110.11 (NL/Netherlands/-)
Failures: 5 (smtpauth)
Interval: 3600 seconds
Blocked:  Permanent Block [LF_SMTPAUTH]

Log entries:

Mar 25 06:11:48 host postfix/smtpd[22877]: warning: unknown[77.247.110.11]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Mar 25 06:11:54 host postfix/smtpd[22882]: warning: unknown[77.247.110.11]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Mar 25 06:12:04 host postfix/smtpd[22872]: warning: unknown[77.247.110.11]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Mar 25 06:12:14 host postfix/smtpd[22887]: warning: unknown[77.247.110.11]: SASL LOGIN authentication failed: Connection lost to authentication server
Mar 25 06:12:24 host postfix/smtpd[22889]: warning: unknown[77.247.110.11]: SASL LOGIN authentication failed: Connection lost to authentication server

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