Unable to Login / Register Under 4.3.3

Hi there,

I’m currently unsure is there an issue with my Ghost or with the recent update to 4.3.3. Currently, this current version of Ghost, I am unable to Sign in to an existing account or register for a new free account. Hope someone can assist. Thank you so much!


  • How was Ghost installed and configured? - Ubuntu > Ghost-CLI > Ghost 4.3.3
  • What Node version, database, OS & browser are you using?
  • Node v14.16.1
  • MySQL Ver 8.0.23-0ubuntu0.20.04.1 for Linux on x86_64
  • OS macOS Catalina 10.15.7
  • Chrome 90.0.4430.93 (Official Build) (x86_64)

Hi there,

Was wondering if anyone can further assist me on this issue as 4 days had passed and the problem still persist. Hope someone can help. Thank you!

Below is a screen shot of me trying to Sign up but was faced with the error, same goes to trying to login. Please help!

I was able to solve this by setting up Mailgun following this

But you still need to add the host key to your /var/www/ghost/config.production.json to make everything work

"mail": {
  "transport": "SMTP",
  "options": {
    "service": "Mailgun",
    "host": "smtp.eu.mailgun.org",
    "auth": {
      "user": "postmaster@example.mailgun.org",
      "pass": "1234567890"

You can find the correct host in your Mailgun Dashboard

After this is done, head over to the settings in your ghost admin interface to set the correct API

Make sure you use the Private API key from Mailgun

Please let me know if this helped