The error is triggered by me running
echo "test" | mail -s "test" [email protected]
on another computer. I don't recall ever dealing with passwords when
SENDING mail to an account.

On Fri, Jun 3, 2022 at 5:38 PM Wietse Venema <[email protected]> wrote:
>
> Nathan Dehnel:
> > Jun 03 17:14:51 gentooserver postfix/submission/smtpd[44445]: <
> > unknown[10.0.0.152]: <base64 for old password before it was changed>
>
> The Postfix SMTP server receives that password from the remote SMTP
> client.
>
> > So something is passing around the old password, and I need to know
> > how to change it.
>
> That depends on what the remote SMTP client is.
>
>         Wietse

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