Double opt-in ensures that no fake email address creeps into your database and damages your reputation and deliverability.

http://google.de/url?q=http://absalon.instructure.com/eportfolios/1790/

http://www.google.cc/url?q=http://eou.instructure.com/eportfolios/1715/

http://images.google.co.mz/url?q=http://tecsup.instructure.com/eportfolios/4655/


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