Why won't my Doro Liberto 820 Mini not set e-mail alert to silent?

The e-mail alert cannot be changed. I would like it to be silent, but although it tells me the change is memorised when I press the green tick button, nothing changes

If I understand you correctly, you already tried to set it to silent but it just doesn't work. If that's the case, try restarting your phone and try again. If that still won't work, just set it to a beep. Hopefully that should work. You still would hear a sound but very minimal. Let me know how it goes.

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