[Bug 490935]

[Procrastistamper]

I am also looking for this for TB 5, and would like the same
functionality TB Header Tools had, and the stability of that original
add-on so my mail doesn't get hosed up as can happen with the
"unofficial hack", as it was called above.

FWIW, I agree that the original subject should NOT be overwritten, as
apparently happens with the MailTags suggestion listed above. The
optimum implementation IMHO would be the ability to highlight the
subject and just edit it right there (which even the nefarious Outlook
has). Second most optimum is the right-click option method, and last
(mildly inconvenient but worlds better than no option at all) is to
drill down for the option through the Message menu.

It would be most ideal to have this functionality in TB itself...and
even I'm okay with having to go into Config Editor to manually enable
it.

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

Title:
  it is not possible to modify email subject

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