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I have checked and email address you provided is in the bounce list. Our system gave following result:
email@example.com is IN the bounce list
Reason(s) : smtp; 553 5.3.0 flpd573 DNSBL:RBL 521< 188.8.131.52
I have now removed it from the bounce list and it should be working fine now.
You can follow this guide on how to check and remove the email from bounce list.
And this guides:
Also you should contact your email provider and ask them to Whitelist JotMails IP Addresses.
Please test your form and check if you are receiving submissions now.
Hope this will help. Let us know if you need further assistance.