User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:220.127.116.11) Gecko/2009090216 Ubuntu/9.04 (jaunty) Firefox/3.0.14 Build Identifier: Thunderbird version 18.104.22.168pre (20090924) When composig a message with type 'text/plain; format=flowed' lines beginning with a SPACE character should be escaped with an extra SPACE character. A | | should be encoded as A | | according to section 4.4 of RFC2646. Messages generated by Thunderbird will be rendered as A | | by RFC2646 complient mail clients (i.e. Thunderbird when reading mail). Reproducible: Always
This has apparently been changed in TB 3.1.5, although I couldn't find a mention about it in the Rumbling Edge. However, I don't close the bug: I was going to open a new one when I stumbled upon this. The new behavior makes for surprises when composing a formatted paragraph with a left hanging text, as the one exemplified above ("A |"). It looks fine in TB, but if it goes through a mailing list that removes the format parameter it will be rendered as encoded. Please note that space-stuffing is a MUST in rfc 3676 On generation, any unquoted lines which start with ">", and any lines which start with a space or "From " MUST be space-stuffed. Other lines MAY be space-stuffed as desired. http://tools.ietf.org/html/rfc3676#section-4.4 The point is in the second sentence of that paragraph: By space-stuffing _all_ lines except quoted ones, the least surprise principle will be honored.
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