Depuis un mois environ le texte des messages recus est en minuscule dans le volet de visualisation. Que faire? Merci
Maybe something is lost in the translation.
The subject says that the text is tiny in the preview pane. This may be because to zoom level has changed. You can use Ctrl+0 to reset the zoom, or right-click > Zoom.
In the description you say the text is in lowercase. Usually it is not possible to change the case of a received email because that is how it was sent. Unless you have changed the preferred font to something unusual that does not have capital letters.
Can you maybe post a screenshot of the problem?