[Bug 490935]

[Pascal-crb]

I fully agree with ben.bucksch' comment: it is good practice to keep a trace of trace of what the original Subject line showed.
Sometimes I like to edit the email itself to add comments/annotations to make the content more (re-)usable for myself. In that case I explicitly indicate (eg. by 'keyword' like "_ANNOTATIONS") that this was an entry added after receiving the email.
This feature is not 'comfortably' provided by all my favorite mail-clients though ;-)

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

Title:
  it is not possible to modify email subject

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