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I have checked email address you provided and that email address is in bounce list. Our system gave following result:
firstname.lastname@example.org is IN the bounce list
Reason(s) : smtp; 550 OU-001 (SNT004-MC1F55) Unfortunately, messages from 18.104.22.168 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
I have now removed it from our bounce list.
I would suggest you to contact your email service provider to Whitelist JotMails IP Addresses:
You can follow this guide on how to check and remove the email from bounce list.
Hope this will help. Let us know if you need further assistance.