Tickets :: Comment on [#4664] Display existing alternative rather than removed attachment

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Comment	> How could this situation be detected? > > > > Imp 4.1.2 marks a removed part thusly: > >> ------=_NextPart_001_0001_319166C9.1979B12D > >> Content-Type: text/plain; > >> charset=UTF-8 > >> Content-Disposition: inline > >> Content-Transfer-Encoding: 7bit > >> > >> [Anhang entfernt: Ehemaliger Anhangstyp: text/html, Name: unbenannt] > > > > This is tricky: The only safe criterion is the last line which > depends on the user's option settings. Note that this message may > well be forwarded to another user with different settings, or that > the user may change hir settings, after removing that part. > > > > Another mailer (example seen today, but cannot be attributed to a > particular mailer) does it thusly: > >> ------=_NextPart_000_001B_01C0CA81.7B015D10 > >> Content-ID: <121401Mfdab4$3f3dL780$75387018@57W81fa70Re> > >> MIME-Version: 1.0 > >> Content-Type: text/plain; name="message.pif"; charset="iso-8859-1" > >> Content-Description: Removed Attachment > >> Content-Disposition: attachment; filename="Removed Attachment.txt" > >> Content-Transfer-Encoding: quoted-printable > >> > >> This attachment contained a virus and was stripped. > >> Filename: message.pif > >> Content-Type: audio/x-wav > >> Virus(es): W32/Netsky-Q > > > > Here, the key feature is the Content-Description line, in accordance > with RFC 2045, section 8: this can be set independently of the user's > settings, hence it can easily be detected. > > > > So, my suggestion is: > > - when removing an alternate part, set the Content-Description field, > as in the second example, above; > > - when deciding which alternate part to display, parts marked in this > way should not be regarded as eligible, > > - if possible, parts marked in the way of the 1st example, above, > should also be not eligible for display.
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