To set up Xfce4-mailwatch-plugin, one naturally needs to supply the passwords for the accounts to monitor. Those passwords should be stored in a keyring (e.g. Gnome keyring in my case).
To my opinion they MUST be stored in a keyring, unencrypted storage of passwords should be considered an important security bug.
I use the version supplied with Xubuntu 18.04 LTS.
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