What does “UGFzc3dvcmQ6” mean?

Problem: I’m seeing syslog messages like this from Postfix: Dec 3 18:14:13 mailserver postfix/smtpd[10215]: warning: unknown[109.202.9.80]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 The answer is in the secret language of base-64: $ echo “UGFzc3dvcmQ6” | base64 -D Password: $ ‘UGFzc3dvcmQ6’ is the base-64 encoded version of the string ‘Password:’. When an IMAP client tries to connect …

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