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Upon checking your form named "SEEC Contact", I see the email address sc***ponton**1@a**.com is actually in our bounce list. This is the reason that our system outputted:smtp;521 5.2.1 : (DMARC) This message failed DMARC Evaluation for an AOL Domain. For more information please visit http://postmaster-blog.aol.com/2014/04/22/aol-mail-updates-dmarc-policy-to-reject/
I've removed it in our bounce list but please do check this guide on how to prevent bounce related issues on emails: http://www.jotform.com/help/208-How-to-setup-email-alerts-to-prevent-email-bouncing-related-issues.
Pleas do try a test submission by filling out your form and clicking the submit button, see if you are able to receive the notification email.