Comment 9 for bug 30201

(i am assuming, as all people who comment this bug, that this bug refers to a situation where return receipt (RR) options are setted to "Ask me")

I think this could be a good way to handle this bug:
When you open/preview a message with return receipt, a msgBox pop ups:

    +-----------------------------------------------------+
    |"The sender of this message request a return receipt.|
    |If you want send it, use the button in headers bar. |
    | [ OK ] |
    +-----------------------------------------------------+

And a bar is added, similar to the junk-mail one.

    ---------------------------------------------------------------------------
    The sender of this message request a return receipt. [ Send ][ Never send ]
    ---------------------------------------------------------------------------
    [+] Subject: .............. From: .......... ##/##/#### ##:##
    ---------------------------------------------------------------------------
    (mail body)

This way you can read the mail entirely before send confirmation, or you can leave it and be warned by msgBox next time you read it, or you can click on "Never send" and skip further annoyance.

PS: A column "RRReq" (values = {Yes, No}) in mail list also helps, and it's easily visible than a special icon.