Mailgun issue (not sending emails)

So I have everything set-up. I’m getting all my emails but when someone else tries registering or performing an administrative action, such as granting permissions or backing up the server, they’re not receiving their emails.
I checked my mailgun logs and it’s fine with sending emails to me, but when it shows someone else’ email it’s marked as rejected.

「いいね!」 1

You need to validate your domain at Mailgun.

「いいね!」 5

How can I go about doing this?

「いいね!」 1

Try https://app.mailgun.com/app/sending/domains

「いいね!」 2

It’s requiring a credit card which I don’t have one, is there a free, unrestricted alternative?

「いいね!」 1

There is not. Because spam.

「いいね!」 5

Okay, thank you for the help.

「いいね!」 3

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