How does Recaptcha handle multiple users behind the same IP? (i.e. universities)

Hi there! I working on a web project that targets college and university students, and while protecting some forms with Recaptcha we thought of this issue. What would happen if hundreds of students access our website from the same IP? I imagine big institutions own several IPs of their own, but this may not be the case for everyone. Has Google a way to identify this kind of sources or do we have to change our anti-spam protection to a more "permissive" technique? Thanks in advance. -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.

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reCaptcha only numbers

IT IS POSSIBLE TO ADD THIS IN MY WEBSITE JOOMLA? only numbers - not letters! Thanks you for the answer -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.

What is the per day limit of using captcha?

-- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.

Delivery Status Notification (Failure)

Delivery to the following recipient failed permanently: noticias@winkalmail.com Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain winkalmail.com by aspmx.l.google.com. [2a00:1450:400c:c03::1b]. The error that the other server returned was: 552-5.2.2 The email account that you tried to reach is over quota. Please direct 552-5.2.2 the recipient to 552 5.2.2 http://bit.ly/SrT2Vq g3si2782068wiy.17 - gsmtp