On 15 Nov 2019, at 3:36, Jaroslaw Rafa wrote:

By the way: I'm just curious, what does the string "UGFzc3dvcmQ6" in the
failed authentication message mean? I get it with every such attempt.

$ echo "UGFzc3dvcmQ6" |base64 -D
Password:

When you see "SASL LOGIN authentication failed: UGFzc3dvcmQ6" logged by Postfix, it indicates that an incorrect password was provided, in the second step of the LOGIN mechanism, in response to the prompt "334 UGFzc3dvcmQ6" which is sent by the server. It is also possible for Postfix to log "SASL LOGIN authentication failed: VXNlcm5hbWU6" which indicates a failure at the first stage of the LOGIN mechanism.


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Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)

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