I send a mailing, and my mailbox at Yahoo and another mailbox at my own domain at thalasoft.com receive it fine with the subject displaying all right as:

Påminnelse! Le nouveau président de la République : déjeuner - débat du lundi 21 mai à 11h30

But a user has reported receiving it as:

P蚓innelse! Le nouveau pr駸ident de la R駱ublique : d駛euner - d饕at du lundi 21 mai 11h30

He seems to be the only one recipient (of my knowledge) having received it with these funky characters.

Is there any reason for this ?

Kind Regards,