[imp] reCaptcha implementation for IMP.

[Tobias Drewry]

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.

- T

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