Mailgun not working periodically
I'm using Mailgun as the email provider, and some of my users reported that they cannot receive sign-up emails.
- I checked my Mailgun dashboard and found out 30%+ of the emails are "Failed"
- I tried with my own Gmail and Outlook email addresses. It sent to my Gmail, however not Outlook address.
- The Outlook email even didn't go to the spam folder.
