I've received a message from a collegue, his first name is René. Each time I click reply to any of his messages (he is using Microsoft Outlook 2003 or Outlook Web Access 2003 sp1) I get two lines in the to box, one for René with his email address attached, the other with just his last name and no email address. When I hit send, I get an error from my mail server saying it cannot parse the email address because it is not conform the RFC standards. These are the to/from lines from the message, which should be enough to replicate the problem: X-MimeOLE: Produced By Microsoft Exchange V6.5 To: "Houwing, Jesse" <jesse.houwing@sogeti.nl> From: =?iso-8859-1?Q?Xxxxx=2C_Ren=E9?= <xxxx.xxxx@xxxx.nl>

(In reply to comment #0) > From: =?iso-8859-1?Q?Xxxxx=2C_Ren=E9?= <xxxx.xxxx@xxxx.nl> "=2C" is "," in quoted printable, and completely same case as Bug 377370. DUP of Bug 254519.