Thanks all for the help.

Thanks for the tip Kirk, im gonna parse the log, its easier and faster, 
the applications isnt real time, i have time to process the log. The log 
files gonna rotate every hour, gonna process one file per hour.

I also find something usefull, x-sendfile, i didint know that, this was 
the reason i was getting so "slow" req/s using ruby, i think using this 
with sinatra i could get near req/s as apache.



Brian,

About that, yes, its true, most mail block external images. But is the 
only way i can know if the user has read or not the mail.
And the list is send to people who wants the mail, they trust in the 
mail content.
Have any other way to track the mails?


Again, thanks.

Diego Bernardes
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