wrong caracters in email sent in french with accent

Hello Quickbase admin,

this issue is back today, with french accented characters being replaced by something that looks like chineese...
example :  " Veuillez noter quune maintenance pr_ntive a _ planifi_pour l'automate "
original   :  " Veuillez noter qu'une maintenance pr�ventive a �t� planifi�e pour l'automate "

Any info/solution for this ?

As this is part of a text message sent out to customers, it's urgent to fix it.
Thank you