I'm trying to implement sending newsletter emails for my blog. I follow this article Guide except I use Sanity instead of Storyblok.
I managed to verify my domain, trigger Sanity webhook to make POST request, add subscribers' emails to Mailing list but somehow encounter 401 error while trying to send newsletter.
What I have tried:
Switching url parameter from default to 'https://api.eu.mailgun.net'
Switching from my domain to Mailgun sandbox domain.
Switching between Domain Sending API key and Mailgun API key
Adding ngrok Web Interface to Mailgun's IP Access Management
Adding 'key' to key parameter e.g: key:
key-${process.env.MAILGUN_API_KEY}Adding prefix NEXT_PUBLIC to enviroment variables e.g: NEXT_PUBLIC_MAILGUN_API_KEY
Install dotenv package
What I think could cause the error: my domain is registered in Vietnam with ending .vn