AUTH=client, available mechanisms do not fulfill requirements, Deferred: Temporary AUTH failure

I followed the procedure to Integrate Amazon SES with Sendmail in Ubuntu as given in the guide. The error log at /var/log/mail.log shows that “AUTH=client, available mechanisms do not fulfill requirements” and “Temporary AUTH failure“. However, it also showed “Message accepted for delivery“. Apr 26 19:35:46 ABC sm-mta[24892]: 33QE5jZl024892: AUTH=client, available mechanisms do not fulfill

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Enable CSF Block Lists To Block Bots Malicious Traffic

CSF or Config Server Firewall is an essential firewall that every VPS should have in order to protect the server from being bombarded by thousands of malicious bots. The bots do various nefarious activities such as ‘port scanning’ (looking for which ports are open and vulnerable for intrusion), ‘Brute force login’ (guessing various combinations of username and password) etc