Too many white spaces in MIMEHeader cause white space in mail body

I have the problem that every mail begins with a white space. First i thougt it is a problem of the mail body but it is a problem of the mime header. There are two white spaces - one white space is needed to split header and body information but the second white space goes directly into the body and turns up as a beginning white space in every mail.

In PreSend() of phpmailer class you can remove one white space in MIMEHeader and then it works without a white space in mail body.