User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.5) Gecko/2008122913 Gentoo Firefox/3.0.5 Build Identifier: version 2.0.0.19 (20090102) As I understand it fields in an email's message header which contain non-us-ascii characters need to be quoted by the sender (MIME encoded-word syntax). In practice I receive messages with non-ascii header fields (From and Subject fields). Often Thunderbird treats them right but if the body is encoded in UTF-8 and the From field e.g. in Latin-1, then the header field is rendered with replacement characters (question marks) as off the non-ascii character until the end of the field which make the Subject or From lines usually unreadable: Subject: Jane D???????????????????????????? From: John D????????????????????? Reproducible: Always Steps to Reproduce: 1. Open the following e-mail message in latin-1 encoding: From: a@b.c To: a@b.c Subject: äöüabc Content-type: text/plain; charset=UTF-8 Actual Results: The subject is displayed as ?????? Expected Results: The subject should display at least ???abc instead.

I apologise if this is a different bug: What I see is that messages with a Subject header like =?UNKNOWN?B?Mje6IENvbPNxdWlvIEJyYXNpbGVpcm8gZGUgTWF0ZW3hdGljYQ==?= are displayed as a single questionmark-in-black-diamond. The correct display in this case is 27º Colóquio Brasileiro de Matemática It may be that this is not a correctly formatted header, but nevertheless some email clients send subject lines formatted in this way, and it is also a fact that my two other email clients, Eudora 6.2 (Mac) and Felamimail (eGroupWare) do display the header correctly. Here are some more header details from this particular message, in case it can be of any interest: Received: from istanbul.uab.es (istanbul.uab.es [158.109.168.138]) by mail.mat.uab.cat (Postfix) with ESMTP id 88FAD1FD6E for <kock@mat.uab.cat>; Wed, 18 Feb 2009 13:50:41 +0100 (CET) Received: from istanbul.uab.es (localhost [127.0.0.1]) by istanbul.uab.es (Sun Java System Messaging Server 6.1 HotFix 0.10 (built Jan 6 2005)) with ESMTP id <0KF900457ICH3C00@istanbul.uab.es> for kock@mat.uab.cat (ORCPT kock@mat.uab.cat); Wed, 18 Feb 2009 13:50:42 +0100 (CET) Received: from mail pickup service by beta3.impa.br with Microsoft SMTPSVC; Wed, 18 Feb 2009 09:56:28 -0300 From: Coloquio Brasileiro de Matematica <coloquio@impa.br> Subject: =?UNKNOWN?B?Mje6IENvbPNxdWlvIEJyYXNpbGVpcm8gZGUgTWF0ZW3hdGljYQ==?= MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1896 Content-type: TEXT/PLAIN Content-transfer-encoding: 8BIT

Cleanup *dupeme* whiteboard flag from bugs that are marked as Resolved Duplicate!