User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.3) Gecko/20100423 Ubuntu/10.04 (lucid) Firefox/3.6.3 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.4) Gecko/20100526 Lightning/1.0b2pre Thunderbird/3.1 Space(s) before angle brackets in signatures are lost or moved. A line: "My Name <me@example.com>" will become: "My Name<me@example.com>" (space is lost) A line: "My Name <me@example.com> Blah" will become: "My Name<me@example.com> Blah" (space is moved to after closing angle bracket). Reproducible: Always Steps to Reproduce: 1. Create a signature file which contains "My Name <me@example.com>" and configure an account to use it. 2. Compose a message and send it. 3. View the message in the "Sent" folder, or on the receiving end. Actual Results: text/plain messages (or parts) will contain "My Name<me@example.com>" (the space before the angle bracket is missing). HTML parts (if any) will preserve the space. Expected Results: Preserve the exact content of the signature file. IIRC, I started seeing this when I upgraded from Thunderbird 2.x to 3.x (3.0.4, 3.1b2, 3.1rc1).

This is an unfortunate regression from bug 215068, also see bug 448198.