double lines

Hi Im using the phpmailer class to send text emails (not html), it works 100%. So emails sent from a php script look correct in the mail client, however when I first load/show the message in a <textarea> and then send it to the same script which then sends the email, on some mail clients there are double line between paragraphs. Its almost like the <textarea> is putting in a extra \n, how can I test for this or fix this problem. Regards, Clive