[imp] reCaptcha implementation for IMP.

[Tobias Drewry]

Quoting Tobias Drewry <tdrewry at bu.edu>:

> Quoting Tobias Drewry <tdrewry at bu.edu>:
>
>> Quoting Chuck Hagenbuch <chuck at horde.org>:
>>
>>> Quoting Tobias Drewry <tdrewry at bu.edu>:
>>>
>>>> I have just completed adding reCaptcha support to our installs of  
>>>> IMP 4.3.4 and, our well aged, IMP 4.0.4.
>>>>
>>>> If there is any interest in a patch, I'd be happy to put one together.
>>>
>>> What pages/forms did you put the captchas on?
>>
>> ah, right, yes.  Just the Compose window.  For our implementation,  
>> the Captcha is based on number of recipients as a way to prevent  
>> phished accounts from being abused to rapidly.
>
> I should add, by placing the Captcha into the "compose" window, we  
> catch compose, recompose, reply, and forward actions.  I have not  
> dealt with the redirect action because we've disabled it.  I'll add  
> that functionality and post a patch either tomorrow or Wednesday.

Patch will be along shortly.  Found a bug in the version for Imp 4.3.4  
involving automatic spell checking.  Soon as I've got that resolved I  
should be ready to post.

- Tobias

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