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Block "SASL LOGIN authentication failed: UGFzc3dvcmQ6"

Mon Sep 02, 2019 11:17 pm

Hello everyone:

I have a server with postfix installed and I have many messages saying: "sasl login authentication failed: ugfzc3dvcmq6".

My question is, how do I block automatic to port 25 containing "sasl login authentication failed: ugfzc3dvcmq6" and allow a maximum of 7 login failed?

Thank you very much in advance for the help.

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