Based on that error, you'll either have to add the email address you're using in the CONTACT_TO_EMAIL_ADDRESS env var to the authorized recipients in your Mailgun Account Settings (see more about that here) or move off the sandbox domain to your very own custom domain.
Hope that helps!
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Hey Jeff -
Based on that error, you'll either have to add the email address you're using in the
CONTACT_TO_EMAIL_ADDRESSenv var to the authorized recipients in your Mailgun Account Settings (see more about that here) or move off the sandbox domain to your very own custom domain.Hope that helps!