Log: postfix-sasl-failedlogin
May 20 23:56:19 mx1 postfix/smtps/smtpd[3425910]: warning: unknown[118.189.183.180]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
For: Linux server running postfix - smtp server
Meaning: Postfix SASL login failed. Someone tried to authenticate via SMTPS from 118.189.183.180 (Singapore).
What to do: If you see many requests from the same IP, we recommend blocking it.
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