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由 abe421 发表于 Sept. 19, 2011 · 永久链接

A good trick for thunderbird user who want to definitively uncrypt an email.
Move the mail in your draft directory.
Open it and click on "Modify", add a space and save (and say "no" when asking for crypting).
You can now move it on its original directory.
So, now we can hope that somebody writes a module to do that automatically.
The point is not to save the uncrypted file outside, But on our personal computer.
So we have choice to keep security for mail that really need and pass in text other message to allow text manipulation.