Hide the SMTP server password from system console
The system console shows the SMTP server password in clear. No other application/website with sane defaults does that. Some offer a button next to the password field to reveal the password temporarily, so the user can make sure no one is standing next to them who could see the secret.
I actually consider this a bug, but it was rejected as such: https://github.com/mattermost/mattermost-server/issues/10909
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This was fixed in v5.13 release,