phpmailer subject line wierdness

I know that there is a phpmailer list, but it's pretty low volume, so I hoped you all might have some ideas on this. If I set the subject line for a mail like: $mail->Subject = 'Jconnect Passover Registration Confirmation'; The email never send, but if I stick a letter between O and N it goes out: $mail->Subject = 'Jconnect Passover Registration Confirmatioan'; Any ideas? Does the 'on' translate to some weird line end character? Can I try and re-encode it or something? Mark