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Hey @mjw
Sorry I am bring this up again, I search the forum for a solution and I came across this your post: Failed to send magic link email Error when trying to sign up - #14 by mjw

"mail": {
    "from": "<email>",
    "transport": "SMTP",
    "options": {
      "host": "smtp.eu.mailgun.org",
      "port": 587,
      "service": "Mailgun",
      "secure": false,
      "requireTLS": true,
      "auth": {
        "user": "<email>",
        "pass": "<password>"
      }
    }
  },

I tried out and it did not work out.