Need Help for Zoho Survey

Need Help for Zoho Survey

Hello,
Actually i have created for zoho survey and i have sent 500 emailid's out of 500, 445 emails are failed so i have done is i have collect those failed emailid's and againg created survey and resent the same emailid's but its not sent. can you please help me how to send againg  those email id's..



Susmita singh
ph no. +91 8886666433