When contact forms stop sending email notifications, website owners often assume there is a problem with the form plugin itself. In reality, email delivery providers frequently play a significant role in notification failures, especially when bounce handling and suppression lists are involved.
This guide explains how to troubleshoot WordPress form email notification issues involving Mailgun suppression lists and bounced recipients.
Issue Background
A WordPress website was successfully recording contact form submissions and Addify Request a Quote form entries, but notification emails were no longer reaching the intended recipients. Because submissions were still being logged within WordPress, the issue appeared to be related to email delivery rather than form functionality.
The website had recently undergone plugin updates, including updates affecting Mailgun integration.
Diagnosis
Investigation focused on form configuration, email delivery settings, and Mailgun account activity.
- Form submissions were successfully recorded.
- Notification rules were configured correctly.
- Mailgun was responsible for outbound email delivery.
- Recipient addresses were not receiving notifications.
- No WordPress form errors were present.
Reviewing Mailgun activity revealed that recipient addresses had been added to the suppression list following previous bounce events. Once suppressed, Mailgun automatically blocked future deliveries to those recipients.
Resolution Steps
1. Verify form notification settings
Confirm that Gravity Forms, Contact Form plugins, or Addify Request a Quote notifications are configured correctly.
2. Test form submissions
Submit test entries and verify that records appear within WordPress.
3. Review Mailgun logs
Inspect delivery logs, bounce events, and suppression activity.
4. Check suppression lists
Identify recipient addresses that have been blocked following bounce events.
5. Remove valid recipients from suppression
Restore delivery eligibility for legitimate email addresses.
6. Monitor deliverability
Continue monitoring bounce rates and notification performance after corrections are made.
Final Outcome
After identifying and removing affected recipients from Mailgun’s suppression list, form notification emails resumed normal delivery. The solution restored communication workflows without requiring changes to the WordPress forms themselves.
Organizations using Mailgun, Gravity Forms, Addify Request a Quote, WooCommerce inquiries, and WordPress contact forms should periodically review suppression lists and bounce activity to maintain reliable email delivery.
If you need help troubleshooting WordPress email delivery, Mailgun integrations, form notifications, deliverability issues, or WooCommerce inquiry workflows, contact Freshy.
