User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.4) Gecko/20070515 Firefox/2.0.0.4 Build Identifier: version 2.0.0.0 (20070326) When getting mail from people that has an accent in the surnames, the email address is identified as two different emails. When trying to reply, it will reply to two addresses. Also, this is a problem when trying to add it to the addressbook. Reproducible: Always Steps to Reproduce: 1. You receive a mail from: surname1 surnamé2, name <name.surname@bla.com> which contains an accent. 2. click Reply (NOT reply all) 3. You get two "To:", first one to "surname1 surnamé2", second one to "name <name.surname@bla.com> 4. If you try to send, you get an error because of the first "To:" Actual Results: Problems sending mails and adding to addressbook.

Didn't test but looks like the comma is the problem. (Commma separetes email addresses, and if it's included in the name, the name needs to be quoted.) Via bug 362849 -> dupe of bug 254519