Delayed or failed email delivery with Mailgun: Messages stuck in 'Accepted' status

I’m having trouble with Mailgun for my website. The emails I send through their HTTP API get marked as ‘accepted’ in the logs but they take forever to be delivered. Sometimes they don’t even make it to the recipients at all.

I’ve tried sending to different email domains and at various times but the issue persists. I’m pretty sure it’s not a problem with the recipient’s email server.

Here’s what typically happens:

  1. My script calls Mailgun’s API to send an email
  2. Mailgun logs show the message as ‘accepted’
  3. The email sits in ‘accepted’ status for a long time
  4. Often, it never gets delivered

I’ve double-checked the API arguments but can’t spot anything wrong. Has anyone run into this before? Any ideas on how to fix it?

I can share a sanitized JSON log entry if that would help troubleshoot the problem. Just let me know if you need more info.

hey, i’ve dealt with this mess before. check ur sending limits on mailgun. sometimes they throttle ya if u hit the cap. also, make sure ur not on any blacklists. thats a real pain. if all else fails, maybe try a different email service? sendgrid worked for me when mailgun was actin up. good luck!

I’ve encountered this issue before, and it can be quite frustrating. One key thing to check is your IP warm-up process. If you’re using a new sending IP or have recently increased your volume, Mailgun might be throttling your sends to protect your sender reputation.

Another potential culprit could be content filtering. Some words or phrases in your emails might be triggering spam filters, causing delays or non-delivery. Try reviewing and adjusting your email content to see if that improves delivery rates.

It’s also worth verifying your email authentication setup. Ensure you’ve properly configured DMARC in addition to SPF and DKIM, as this can significantly impact deliverability.

If the problem persists, consider implementing a fallback system by setting up a secondary email service provider to use when Mailgun messages remain in the ‘accepted’ status for too long. This can help ensure your critical emails are delivered.

I’ve faced similar issues with Mailgun in the past, and it can be frustrating. One thing that helped me was checking my domain’s DNS settings. Make sure your SPF and DKIM records are correctly set up. Incorrect DNS configuration can cause delays or delivery failures.

Another potential cause could be your sending reputation. If you’ve recently increased your email volume or had a spike in bounces, Mailgun might throttle your sends. Try gradually ramping up your email volume and keeping a close eye on your bounce rates.

Have you checked your Mailgun dashboard for any account warnings or limits? Sometimes there are issues with billing or account status that can affect delivery.

Lastly, I’d recommend reaching out to Mailgun support directly. They can provide more detailed logs and insight into what’s happening on their end. In my experience, their support team has been helpful in diagnosing these types of issues.