On 13 May 2018, at 1:27 (-0400), @lbutlr wrote:

On 2018-05-12 (23:01 MDT), Viktor Dukhovni <[email protected]> wrote:

On May 13, 2018, at 12:42 AM, @lbutlr <[email protected]> wrote:

In these log lines, what is "UGFzc3dvcmQ6"?

May 12 07:52:07 mail submit-tls/smtpd[32670]: warning: vps1590651.vs.webtropia-customer.com[62.141.41.104]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

$ printf "%s\n" $(printf "%s\n" UGFzc3dvcmQ6 | openssl base64 -d)
Password:

So, is that what the morons tried to login with (I have a few others that using your snippet decode to "Username:" (VXNlcm5hbWU6), they are trying to login with a base64 encode of "Usernae:" or "Password:"?

No, Postfix is logging the stage of an authentication failure in the SASL LOGIN mechanism. It would be unwise to routinely log the wrong credentials used by people who typo a username or password or by bots that have a list of username+password combinations acquired elsewhere.

--
Bill Cole
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(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
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