Sending emails to a mailing list with Mailgun - node.js

Question

I am creating a personal app for email marketing/news letter/campaign, for this am using the Mailgun API with node.js and a simple HTML form to send emails.
As of now, sending emails is working fine when I give the "to"-address directly in my front part. But when I try to send to a mailing list, I encounter some issues.
I'm trying to send emails to a list which is already created in my Mailgun account.
My below post method is to send mails.
app.post('/', function(req, res) {
var api_key = 'key-here';
var domain = 'mydomin.in';
var Mailgun = require('mailgun-js');
var mailgun = new Mailgun({ apiKey: api_key, domain: domain });
var data = {
from: req.body.myname + "<" + req.body.email + ">",
to: req.body.to,
subject: req.body.subject,
text: req.body.plaintext,
'o:tag': req.body.tag
};
console.log(req.body);
mailgun.messages().send(data, function(error, body) {
console.log(body);
var list = mailgun.lists(req.body.to);
list.members().list(function (err, members) {
// `members` is the list of members
console.log(members);
});
if (error) {
// email not sent
res.render('index', { title: 'No Email', msg: 'Error. Something went wrong.', err: true })
} else {
// Yay!! Email sent
res.render('index', { title: 'Sent Email', msg: 'Yay! Message successfully sent.', err: false })
}
});
});
In the code I mention my mailing list. What happens is when I hit send, it shows success as in the following image:
Finally, here are some logs from the mailgun dashboard
Please point out what I did wrong and share your suggestions how to send emails to the list. My approach may be totally wrong, so any guidance will be appreciated.
NOTE: from my console.it shows "thank you,the messages are in queue". but am not receiving any mails yet. Many many thanks for any help.

Answer 1

Official docs
https://help.mailgun.com/hc/en-us/articles/217531258:
If you're on the Free plan without credit card information present or using your sandbox domain for testing, you're restricted to sending just to Authorized Recipients.