If you are testing your autoresponder after integration you must use an actual email address that has not been used previously in an email list. This is a rule set by the autoresponder you're integrating with, not OSP. You may need to check your spam folder or social/promotions tab if using Gmail. Emails are sent via the autoresponder such as GetResponse, AWeber or others.
The best way to test is to enter your own email address, check your spam/junk/promotions folder, and know that this will work only the first time, as the autoresponder will then add your email to the campaign list.