I have a problem to add a new line to the body of my email when I am using '<a href="mailto: ...>" function

Hi, I have a problem to add a new line to the body of my email when I am using '<a href="mailto: ...>" function. This is my code: $details[email] //email of the user from the form $details[contact_name] //name of the user from the form $email_subject = "subject text..."; $email_form = "Welcome ".$details[contact_name].",%0D%0A%0D%0A"; $email_form .= "Thank you for registering with ...."; <a href='mailto:".$details[email]."?Body=".$email_form."&Subject=".$email_subje ct."' class='darkblue'>Send the email</a> I am not sending the email with details from a form automatically because of a request of my client that wants to be able to add an additional text for a user if needed. What is strange. I have tried it on different computers where it works, but doesn't work on the client computer. Is there something I need to setup to support the '%0D%0A' character on the clients computer ? Or does somebody know a different character for making a new line? Please, help me. I can't find anything I can do to fix it. Thank you, Martin