[Bug 490935]

[wilfriedh]

I just found the new extension (as of Sept. 2011) "editemailsubject"
(must be typed as written, without blanks, in Thunderbird's extensions
search). It allows to edit the subject displayed in the mailbox window
while preserving the subject in the message header. Exactly what I was
looking for.

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https://bugs.launchpad.net/bugs/490935

Title:
  it is not possible to modify email subject

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