Ghost Mailgun Not Sending Newsletter

How to fix it

Try these in order — the most common fix is first.

1. 1. Recheck Mailgun settings

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   1. Ghost Admin > Settings > Email newsletter > Mailgun
   2. Match region, domain name and the private API key exactly
   3. Use a verified custom domain, not the sandbox
   Did this fix it? Yes No

2. 2. Check limits and logs

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   1. Open Mailgun Logs and look for rejected or limited events
   2. Ask Mailgun to lift new-account limits
   3. On self-hosted run ghost log and look for email errors
   Did this fix it? Yes No

3. 3. Self-hosted: check config and database

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   1. Make sure config.production.json has the mail block you expect
   2. Restart with ghost restart
   3. Use MySQL rather than SQLite for large lists
   Did this fix it? Yes No

Symptoms

Post shows "Published and sending to N members" but Mailgun logs are empty, or the newsletter fails with "An unexpected error occurred". Test emails may still work.

Why it happens

• Wrong Mailgun region (US vs EU), domain or API key in Settings
• Mailgun sandbox domain or unverified domain
• New Mailgun account under a low sending limit
• SMTP configured, but Ghost newsletters require the Mailgun API
• Large lists on SQLite hitting database errors

This guide also covers

• ghost mailgun not sending
• ghost newsletter not sending
• ghost failed to send newsletter
• ghost mailgun setup

The same problem in other apps

All notifications, reminders & messages not sending guides →

• Substack Emails Going to Spam or Promotions (Substack)
• beehiiv Emails Going to Spam (beehiiv)
• Webflow Form Submissions Not Sending Emails (Webflow)
• Buttondown Emails Going to Spam (Buttondown)

Other Ghost errors

• Ghost Emails Going to Spam
• Ghost Member Signup Not Working
• Ghost Stripe Not Connecting
• Ghost Self-Hosted Update Failed
• Ghost Custom Domain Not Working
• How to Cancel Ghost(Pro)
• Ghost Theme Upload Failed
• Ghost Member Email Disabled