How to insert a "carriage return" in a text of a mail ?

Hi to all,

I'm facing a problem in an FB desktop app (WIN) which is supposed to automatically send emails.

Everything works ok except that the line feed instructions inserted in the mail text are ok if i try to visualize the text in a preview textfield in FB, but are not taken in consideration in the message displayed on the recipient screen (both with outlook and thunderbird).

I've tried various solutions such as "\n" or String.fromCharCode(13) + String.fromCharCode(10) without success.

Thks in advance for help

Best regards