Author Topic: SASL LOGIN authentication failed: UGFzc3dvcmQ6  (Read 37 times)

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SASL LOGIN authentication failed: UGFzc3dvcmQ6
« on: June 13, 2018, 01:52:32 AM »
Hi All,

I am getting the following regularly on my log. like every couple of minutes

Jun 13 11:44:26 host postfix/smtpd[3433]: warning: unknown[185.234.216.204]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

Is there are way to stop theses? What is it created from? Is there a simple fix? IP changes all the time.

Please advise ASAP.