mail(): carriage return required??

Hi, I wrote a web based SMTP client using the mail() function. When the mail form is submitted, I pass the content of the form's textarea (the mail body) to the mail() function. When I was testing the script, I wrote some text on different lines in the form: "this is line 1 this is line 2 this the 3rd etc etc" I read the mail fine in my hotmail.com account, but when I read that same mail in my MS Outlook client the mail is one long line of text: "this is line 1 this is line 2 this the 3rd etc etc" I understand from this difference in layout that the 'carriage return' is required. Is there a function that adds a 'carriage return' after every 'newline' found in a string? Or is this another problem? Regards; Eelco.