On Dec 17, 2011, at 6:11 AM, Frederick Cheung wrote:

> 
> 
> On Dec 17, 5:37 am, "Giovanni L." <[email protected]> wrote:
>> I building an application using rails, and I wanna know if is possible
>> to write a code which allows me to be notified or something like that
>> when the user open an email sent through my application. I need to track
>> that information. When I sent an email, I need know. The question to be
>> answered by my app is "Did they read it?"
>> 
> 
> You can't know this with certainty. The most common technique is to
> include a link to a tiny image and log requests to the image
> (obviously include enough in the url that you can workout which email
> is being read). A lot of people have external images turned off for
> their email though

For precisely this reason.

Walter

> 
> Fred
>> Tips in others languages would be ok to me!
>> 
>> Thanks in advance, and sorry for my bad English =))
>> 
>> --
>> Posted viahttp://www.ruby-forum.com/.
> 
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