Modifying the contents of a message

Joshua Cranmer pidgeot18 at
Sat Jan 28 20:31:36 UTC 2012

On 1/26/2012 6:55 PM, Unicorn.Consulting wrote:
> On 27/01/2012 1:49 AM, Jonathan Protzenko wrote:
>> Hi everyone,
>> Ever since I started reading the and 
>> newsgroups, a recurring question about 
>> Thunderbird has been "how can I modify the contents of a message" 
>> from an addon? I recently (less than 7 days ago) replied to this 
>> question twice, and my answer was basically:
>> - inject a message in a local folder,
>> - copy it to the destination folder,
>> - remove the old message.
>> I'm not sure there's a better way, but I guess not. My question is: 
>> could we make that easier by implementing, say, in C++, 
>> nsIMsgFolder::InjectMessageFromStream, making it of course 
>> scriptable? The arguments are:
>> - this is something an addon will want to do, and it seems legitimate 
>> that they should want to do so,
>> - it's better to provide a function for that than to have someone do 
>> it real, real wrong.
>> I'm not very familiar with that area, so I'd be interested in hearing 
>> what others have to say on the matter :).
> When I send my signed message to someone, or SMIME message, I would 
> like to think that I don't have to produce my copy to prove what I 
> sent to the recipient as a matter of course.  If your going to use 
> this type thing, and I can understand where editing the subject may be 
> valid, I would like to see the digital signature removed by 
> Thunderbird if the content is changed.

Given what I have read about multipart/encrypted and multipart/signed, 
the top-level message headers are not included in the signature, so it 
would be perfectly possible to change the Subject header without needing 
a new digital signature. I am not an expert on S/MIME, though, so I 
could just as well be wrong.

Joshua Cranmer
News submodule owner
DXR coauthor

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